### 问题描述

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.

### 代码

Java代码：

public class Solution {
public boolean isUgly(int num) {
if(num<=0) return false;
if(num==1) return true;
while(num%2==0) {
num/=2;
}
while(num%3==0) {
num/=3;
}
while(num%5==0) {
num/=5;
}
return num==1;
}
}