pragma solidity ^0.4.21;
/*YFIG is the abbreviation of YFIGroup. 
YFIG's success is due to the core technology from YFI. 
The development core team comes from the United States, China, and South Korea.
The YFI technology is independently forked and upgraded to a cluster interactive intelligent aggregator, 
which aggregates multiple platforms Agreement to realize the interaction of assets on different decentralized liquidity platforms.*/
contract  IYFIG {
   
    uint256 public totalSupply;

 
    function balanceOf(address _owner) public view returns (uint256 balance);


    function transfer(address _to, uint256 _value) public returns (bool success);


    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);


    function approve(address _spender, uint256 _value) public returns (bool success);


    function allowance(address _owner, address _spender) public view returns (uint256 remaining);


    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

library SafeMath {

  
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {

    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }


  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); 
    uint256 c = a / b;


    return c;
  }



  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }


  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }


  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}


contract YFIG is IYFIG {
    using SafeMath for uint256;

    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowed;

    string public name;                   
    uint8 public decimals;                
    string public symbol;                 

    function YFIG(
        uint256 _initialAmount,
        string _tokenName,
        uint8 _decimalUnits,
        string _tokenSymbol
    ) public {
        balances[msg.sender] = _initialAmount;               
        totalSupply = _initialAmount;                       
        name = _tokenName;                                  
        decimals = _decimalUnits;                            
        symbol = _tokenSymbol;                             
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(_to != address(0));
        require(balances[msg.sender] >= _value);
      
        balances[msg.sender] = balances[msg.sender].sub(_value);
  
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value); 
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        uint256 allowance = allowed[_from][msg.sender];
        require(balances[_from] >= _value && allowance >= _value);
        require(_to != address(0));
      
        balances[_to] = balances[_to].add(_value);
 
        balances[_from] = balances[_from].sub(_value);

        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
 
        emit Transfer(_from, _to, _value); 
        return true;
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        require(_spender != address(0));
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value); 
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        require(_spender != address(0));
        return allowed[_owner][_spender];
    }
}

{
  "compilationTarget": {
    "YFIG.sol": "YFIG"
  },
  "evmVersion": "byzantium",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}