interface IERC20 {
    //function totalSupply() public constant returns (uint256 totalSupply);
    function balanceOf(address _owner) public constant 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 constant returns (uint256 remaining);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address _spender, uint256 _value);
}
function balanceOf(address _owner) public constant returns (uint256 balance);

//function totalSupply() public constant returns (uint256 totalSupply);