Power of Three
Is N a power of three (1, 3, 9, 27, ...)?
Input: one integer N.
Output: YES or NO.
Constraints:
- 1 ≤ N ≤ 109
Sample Tests
Input 1
27
Output 1
YES
Input 2
28
Output 2
NO
Discussion (opens after you solve — no spoilers before)
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