Online PHP editor | refs for R9UJ4

@ 2015-02-28T14:53:01Z

<?php

function calculate($n) {
    $result = 0;
    
    for ($i = 1; $i <= $n; $i++) {
        for($j = 0; $j <= $i + 1; $j++) {
            $result += 1;
        }
    }
    return $result;
}

var_dump(calculate(3));