pragma solidity ^0.5.0;

contract Token{

    // byte20 == address
    uint256 totalSupply = 1000000;
    mapping(address=>uint256) balances;

    event Transfer(address indexed from, address to, uint256 value);

    constructor () public Ownable(msg.sender) {
       balances[msg.sender] = totalSupply;
    }

    function transfer(address recipient, uint256 value)
    public {
        require(balances[msg.sender] >= value);
        balances[msg.sender] -= value;
        balances[recipient] += value;
        emit Transfer(msg.sender, recipient, value);
    }

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

}