contract ERC20Interface {
    // function totalSupply() public constant returns (uint);
    // function balanceOf(address tokenOwner) public constant returns (uint balance);
    // function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
function transfer(address to, uint tokens) public returns (bool success);

// function totalSupply() public constant returns (uint);
// function balanceOf(address tokenOwner) public constant returns (uint balance);
// function allowance(address tokenOwner, address spender) public constant returns (uint remaining);