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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.

**Credits:**

Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

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