Factorion
A factorion equals the sum of the factorials of its digits (145 = 1!+4!+5!). Is N a factorion?
Input: one integer N.
Output: YES or NO.
Constraints:
- 1 ≤ N ≤ 109
Sample Tests
Input 1
145
Output 1
YES
Input 2
146
Output 2
NO
Discussion (opens after you solve — no spoilers before)
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