Lift

<?php
$peopleWaiting = intval(readline());
$cabins = explode(' ', readline());
foreach ($cabins as $index => $cabin) {
    if ($cabin < 4) {
        if ($peopleWaiting + (int)$cabin >= 4) {
            $peopleWaiting -= 4 - $cabin;
            $cabins[$index] = 4;
        } else {
            $cabins[$index] = (int)$cabin + $peopleWaiting;
            $peopleWaiting = 0;
        }
    }
}
if (count($cabins) * 4 > array_sum($cabins)) {
    echo "The lift has empty spots!" . PHP_EOL;
} else if ($peopleWaiting > 0) {
    echo "There isn't enough space! $peopleWaiting people in a queue!" . PHP_EOL;
}
echo implode(' ', $cabins);