function scaledown_rai (amount, ratio) {
    if (amount.length <= ratio.length)
        return "0";
    else
        return amount.substr (0, amount.length - ratio.length)
}

function scaleup_rai (amount, ratio) {
    return amount.concat (ratio)
}

display (scaledown_rai (account_balance (account), Mrai));
send (scaleup_rai (user_input, Mrai))