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:14is not ugly since it includes another prime factor7.
Note:
<li><code>1</code> is typically treated as an ugly number.</li>
<li>Input is within the 32-bit signed integer range: [−2<sup>31</sup>, 2<sup>31 </sup>− 1].</li>