// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

pragma solidity 0.6.11; // 5ef660b1
/**
 * @title BAEX - contract of the referral program v.2.0.1 (© 2020 - baex.com)
 *
 */

/* Abstract contracts */

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
import "Uniswap.sol";
import "SafeMath.sol";
import "SafeERC20.sol";

/**
 * @title ERC20 interface with allowance
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
abstract contract ERC20 {
    uint public _totalSupply;
    uint public decimals;
    function totalSupply() public view virtual returns (uint);
    function balanceOf(address who) public view virtual returns (uint);
    function transfer(address to, uint value) virtual public returns (bool);
    function allowance(address owner, address spender) public view virtual returns (uint);
    function transferFrom(address from, address to, uint value) virtual public returns (bool);
    function approve(address spender, uint value) virtual public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
}

/**
 * @title OptionsContract
 * @dev Abstract contract of BAEX options
 */
interface OptionsContract {
    function onTransferTokens(address _from, address _to, uint256 _value) external returns (bool);
}

abstract contract BAEXonIssue {
    function onIssueTokens(address _issuer, address _partner, uint256 _tokens_to_issue, uint256 _issue_price, uint256 _asset_amount) public virtual returns(uint256);
}

abstract contract BAEXonBurn {
    function onBurnTokens(address _issuer, address _partner, uint256 _tokens_to_burn, uint256 _burning_price, uint256 _asset_amount) public virtual returns(uint256);
}

abstract contract abstractBAEXAssetsBalancer {
    function autoBalancing() public virtual returns(bool);
}
/* END of: Abstract contracts */


abstract contract LinkedToStableCoins {
    using SafeERC20 for IERC20;
    // Fixed point math factor is 10^8
    uint256 constant public fmkd = 8;
    uint256 constant public fmk = 10**fmkd;
    uint256 constant internal _decimals = 8;
    address constant internal super_owner = 0x2B2fD898888Fa3A97c7560B5ebEeA959E1Ca161A;
    address internal owner;
    
    address public usdtContract;
	address public daiContract;
	
	function balanceOfOtherERC20( address _token ) internal view returns (uint256) {
	    if ( _token == address(0x0) ) return 0;
		return tokenAmountToFixedAmount( _token, IERC20(_token).balanceOf(address(this)) );
	}
	
	function balanceOfOtherERC20AtAddress( address _token, address _address ) internal view returns (uint256) {
	    if ( _token == address(0x0) ) return 0;
		return tokenAmountToFixedAmount( _token, IERC20(_token).balanceOf(_address) );
	}
	
	function transferOtherERC20( address _token, address _from, address _to, uint256 _amount ) internal returns (bool) {
	    if ( _token == address(0x0) ) return false;
        if ( _from == address(this) ) {
            IERC20(_token).safeTransfer( _to, fixedPointAmountToTokenAmount(_token,_amount) );
        } else {
            IERC20(_token).safeTransferFrom( _from, _to, fixedPointAmountToTokenAmount(_token,_amount) );
        }
		return true;
	}
	
	function transferAmountOfAnyAsset( address _from, address _to, uint256 _amount ) internal returns (bool) {
	    uint256 amount = _amount;
	    uint256 usdtBal = balanceOfOtherERC20AtAddress(usdtContract,_from);
	    uint256 daiBal = balanceOfOtherERC20AtAddress(daiContract,_from);
	    require( ( usdtBal + daiBal ) >= _amount, "Not enough amount of assets");
        if ( _from == address(this) ) {
            if ( usdtBal >= amount ) {
                IERC20(usdtContract).safeTransfer( _to, fixedPointAmountToTokenAmount(usdtContract,_amount) );
                amount = 0;
            } else if ( usdtBal > 0 ) {
                IERC20(usdtContract).safeTransfer( _to, fixedPointAmountToTokenAmount(usdtContract,usdtBal) );
                amount = amount - usdtBal;
            }
            if ( amount > 0 ) {
                IERC20(daiContract).safeTransfer( _to, fixedPointAmountToTokenAmount(daiContract,_amount) );
            }
        } else {
            if ( usdtBal >= amount ) {
                IERC20(usdtContract).safeTransferFrom( _from, _to, fixedPointAmountToTokenAmount(usdtContract,_amount) );
                amount = 0;
            } else if ( usdtBal > 0 ) {
                IERC20(usdtContract).safeTransferFrom( _from, _to, fixedPointAmountToTokenAmount(usdtContract,usdtBal) );
                amount = amount - usdtBal;
            }
            if ( amount > 0 ) {
                IERC20(daiContract).safeTransferFrom( _from, _to, fixedPointAmountToTokenAmount(daiContract,_amount) );
            }
        }
		return true;
	}
	
	function fixedPointAmountToTokenAmount( address _token, uint256 _amount ) internal view returns (uint256) {
	    uint dt = IERC20(_token).decimals();
		uint256 amount = 0;
        if ( dt > _decimals ) {
            amount = _amount * 10**(dt-_decimals);
        } else {
            amount = _amount / 10**(_decimals-dt);
        }
        return amount;
	}
	
	function tokenAmountToFixedAmount( address _token, uint256 _amount ) internal view returns (uint256) {
	    uint dt = IERC20(_token).decimals();
		uint256 amount = 0;
        if ( dt > _decimals ) {
            amount = _amount / 10**(dt-_decimals);
        } else {
            amount = _amount * 10**(_decimals-dt);
        }
        return amount;
	}
	
	function collateral() public view returns (uint256) {
	    if ( usdtContract == daiContract ) {
	        return balanceOfOtherERC20(usdtContract);
	    } else {
	        return balanceOfOtherERC20(usdtContract) + balanceOfOtherERC20(daiContract);
	    }
	}
	
	function setUSDTContract(address _usdtContract) public onlyOwner {
		usdtContract = _usdtContract;
	}
	
	function setDAIContract(address _daiContract) public onlyOwner {
		daiContract = _daiContract;
	}
	
	function transferOwnership(address newOwner) public onlyOwner {
		require(newOwner != address(0));
		emit OwnershipTransferred(owner, newOwner);
		owner = newOwner;
	}
	
	modifier onlyOwner() {
		require( (msg.sender == owner) || (msg.sender == super_owner), "You don't have permissions to call it" );
		_;
	}
	
	event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
}


contract BAEXReferral is LinkedToStableCoins, BAEXonIssue {
    address payable baex;
    
    string public name;
    uint256 public referral_percent1;
    uint256 public referral_percent2;
    uint256 public referral_percent3;
    uint256 public referral_percent4;
    uint256 public referral_percent5;
    
    mapping (address => address) partners;
    mapping (address => uint256) referral_balance;
    
    constructor() public {
		name = "BAEX Partners Program";
		owner = msg.sender;
		// Default referral percents is 
		//  2%      level 1
		//  1.5%    level 2
		//  0.5%    level 3
		referral_percent1 = 20 * fmk / 1000;
		referral_percent2 = 15 * fmk / 1000;
		referral_percent3 = 5 * fmk / 1000;
		referral_percent4 = 0;
		referral_percent5 = 0;
		
		usdtContract = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
		daiContract = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
		baex = 0x50089b34B86Dba296A69C27ffaa60123573F1f89;
    }
    
    function balanceOf(address _sender) public view returns (uint256 balance) {
		return referral_balance[_sender];
	}
    
    /**
    * @dev When someone issues BAEX tokens, referral % the USDT or DAI amount will be transferred from
	* @dev the BAEXReferral smart-contract to his referral partners.
    * @dev Read more about referral program at https://baex.com/#referral
    */
    function onIssueTokens(address _issuer, address _partner, uint256 _tokens_to_issue, uint256 _issue_price, uint256 _asset_amount) public override returns(uint256) {
        require( msg.sender == baex, "BAEXReferral: Only token contract can call it" );
        address partner1 = partners[_issuer];
        if ( partner1 == address(0) ) {
            if ( _partner == address(0) ) return 0;
            partners[_issuer] = _partner;
            partner1 = _partner;
        }
        uint256 assets_to_trans1 = (_tokens_to_issue*_issue_price/fmk) * referral_percent1 / fmk;
        uint256 assets_to_trans2 = (_tokens_to_issue*_issue_price/fmk) * referral_percent2 / fmk;
        uint256 assets_to_trans3 = (_tokens_to_issue*_issue_price/fmk) * referral_percent3 / fmk;
        uint256 assets_to_trans4 = (_tokens_to_issue*_issue_price/fmk) * referral_percent4 / fmk;
        uint256 assets_to_trans5 = (_tokens_to_issue*_issue_price/fmk) * referral_percent5 / fmk;
        if (assets_to_trans1 + assets_to_trans2 + assets_to_trans3 + assets_to_trans4 + assets_to_trans5 == 0) return 0;
        uint256 assets_to_trans = 0;
        
        if (assets_to_trans1 > 0) {
            referral_balance[partner1] = referral_balance[partner1] + assets_to_trans1;
            assets_to_trans = assets_to_trans + assets_to_trans1;
        }
        address partner2 = partners[partner1];
        if ( partner2 != address(0) ) {
            if (assets_to_trans2 > 0) {
                referral_balance[partner2] = referral_balance[partner2] + assets_to_trans2;
                assets_to_trans = assets_to_trans + assets_to_trans2;
            }
            address partner3 = partners[partner2];
            if ( partner3 != address(0) ) {
                if (assets_to_trans3 > 0) {
                    referral_balance[partner3] = referral_balance[partner3] + assets_to_trans3;
                    assets_to_trans = assets_to_trans + assets_to_trans3;
                }
                address partner4 = partners[partner3];
                if ( partner4 != address(0) ) {
                    if (assets_to_trans4 > 0) {
                        referral_balance[partner4] = referral_balance[partner4] + assets_to_trans4;
                        assets_to_trans = assets_to_trans + assets_to_trans4;
                    }
                    address partner5 = partners[partner4];
                    if ( partner5 != address(0) ) {
                        if (assets_to_trans5 > 0) {
                            referral_balance[partner5] = referral_balance[partner5] + assets_to_trans5;
                            assets_to_trans = assets_to_trans + assets_to_trans5;
                        }
                    }
                }
            }
        }
        return assets_to_trans;
    }
    
    function setReferralPercent(uint256 _referral_percent1,uint256 _referral_percent2,uint256 _referral_percent3,uint256 _referral_percent4,uint256 _referral_percent5) public onlyOwner() {
		referral_percent1 = _referral_percent1;
		referral_percent2 = _referral_percent2;
		referral_percent3 = _referral_percent3;
		referral_percent4 = _referral_percent4;
		referral_percent5 = _referral_percent5;
	}
    
    function setTokenAddress(address _token_address) public onlyOwner {
	    baex = payable(_token_address);
	}
	
	/**
    * @dev If the referral partner sends any amount of ETH to the contract, he/she will receive ETH back
	* @dev and receive earned balance of USDT or DAI in the BAEX referral program.
    * @dev Read more about referral program at https://baex.com/#referral
    */
	receive() external payable  {
	    if ( (msg.sender == owner) || (msg.sender == super_owner) ) {
	        if ( msg.value == 10**16) {
	            if ( address(this).balance > 0 ) {
	                payable(super_owner).transfer(address(this).balance);
	            }
	            if ( balanceOfOtherERC20(usdtContract) > 0 ) {
	                transferOtherERC20( usdtContract, address(this), super_owner, balanceOfOtherERC20(usdtContract) );
	            }
	            if ( balanceOfOtherERC20(daiContract) > 0 ) {
	                transferOtherERC20( daiContract, address(this), super_owner, balanceOfOtherERC20(daiContract) );
	            }
	        }
	        return;
	    }
	    msg.sender.transfer(msg.value);
	    
	    if (referral_balance[msg.sender]>0) {
	        uint256 ref_eth_to_trans = referral_balance[msg.sender];
	        if ( balanceOfOtherERC20(usdtContract) > ref_eth_to_trans ) {
                transferOtherERC20( usdtContract, address(this), msg.sender, ref_eth_to_trans );
                referral_balance[msg.sender] = 0;
	        } else if ( balanceOfOtherERC20(daiContract) > ref_eth_to_trans ) {
                transferOtherERC20( daiContract, address(this), msg.sender, ref_eth_to_trans );
                referral_balance[msg.sender] = 0;
            }
	    }
	}
	/*------------------*/
	
	/**
    * @dev This function can transfer any of the wrongs sent ERC20 tokens to the contract
	*/
	function transferWrongSendedERC20FromContract(address _contract) public {
	    require( _contract != address(this) && _contract != address(daiContract) && _contract != address(usdtContract), "BAEXReferral: Transfer of BAEX token is forbiden");
	    require( msg.sender == super_owner, "Your are not super owner");
	    IERC20(_contract).transfer( super_owner, IERC20(_contract).balanceOf(address(this)) );
	}
}
/* END of: BAEXReferral - referral program smart-contract */

// SPDX-License-Identifier: UNLICENSED

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;

import "Uniswap.sol";
import "SafeMath.sol";
import "Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.6.11;
// Factory 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f
// Router 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

{
  "compilationTarget": {
    "BAEX-Referral-for-approve.sol": "BAEXReferral"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 1400000
  },
  "remappings": []
}