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:
Input: 14
Output: false 
Explanation: 14 is not ugly since it includes another prime factor 7.
Note:
       1 is typically treated as an ugly number.
       Input is within the 32-bit signed integer range: [−231,  231 − 1].
class Solution:
     def isUgly(self, num):
         """
         :type num: int
         :rtype: bool
         """
         for p in [2,3,5]:
             while num%p == 0 < num:
                 num /= p
         return num==1
class Solution:
     def isUgly(self, num):
         """
         :type num: int
         :rtype: bool
         """
         for p in [2,3,5]:
             while num%p == 0 < num:
                 num /= p
         return num==1