contract ERC20TokenInterface {
    // these functions aren't abstract since the compiler doesn't recognize automatically generated getter functions as functions
    function totalSupply() public constant returns (uint256 totalSupply) {}
    function balanceOf(address _owner) public constant returns (uint256 balance) {}
    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {}

    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);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
/*
 ERC20 Standard Token interface
 */
function totalSupply() public constant returns (uint256 totalSupply) {}

// these functions aren't abstract since the compiler doesn't recognize automatically generated getter functions as functions