Sample Input
5
1000000001 1000000002 1000000003 1000000004 1000000005Out Put
5000000015
<?php
function aVeryBigSum($ar) {
return array_sum($ar);
}
$ar = [1000000001, 1000000002, 1000000003, 1000000004, 1000000005];
echo aVeryBigSum($ar);