題目：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. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

代碼：

def isUgly(self, num):
    """
    :type num: int
    :rtype: bool
    """
    if num==None or num==0:
        return False
    while num%2 == 0:
        num /= 2
    while num%3 ==0:
        num /= 3
    while num%5 ==0:
        num /= 5
    if num == 1:
        return True
    else:
        return False