01. SoftUni Reception

<?php

$a = readline();
$b = readline();
$c = readline();
$questions = readline();

$answers = $a + $b + $c;

$hours = ceil($questions/$answers);
$hours += floor($hours / 3);
if($hours%4==0&&$hours>1){
$hours--;
}
echo "Time needed: {$hours}h.";