Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5.

Example 1:

Input: 6
Output: true
Explanation: 6 = 2 × 3

Example 2:

Input: 8
Output: true
Explanation: 8 = 2 × 2 × 2

Example 3:

14
7

Note:

  1. 1 is typically treated as an ugly number.
  2. Input is within the 32-bit signed integer range: [−231,  231 − 1].
class Solution(object):
    def isUgly(self, num):
        """
        :type num: int
        :rtype: bool
        """
        # greddy        
        if num <= 0: return False
        for x in [2, 3, 5]:
            while num % x == 0:
                num = num / x
        return num == 1
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