class Solution {

    /**
     * @param Integer $num
     * @return Boolean
     */
    function isUgly($num) {
    if ($num < 1) {
        return false;
    }

    while ($num % 2 == 0) {
        $num = floor($num / 2);
    }
    while ($num % 3 == 0) {
        $num = floor($num / 3);
    }
    while ($num % 5 == 0) {
        $num = floor($num / 5);
    }
    return $num == 1;
    }
}