326. Power of Three

class Solution {

    /**
     * @param Integer $n
     * @return Boolean
     */
    function isPowerOfThree($n) {
        if ($n < 1) {
            return false;
        }
        $result = 1;
        while ($n > 1){
            if ($n % 3 != 0) {
                return false;
            }
            $n /= 3; 
            ++$result;
        }

        return $result;
    }
}