Abundant Number
A number is abundant if the sum of its proper divisors exceeds it (12: 1+2+3+4+6 = 16 > 12). Is N abundant?
Input: one integer N.
Output: YES or NO.
Constraints:
- 1 ≤ N ≤ 109
Sample Tests
Input 1
12
Output 1
YES
Input 2
13
Output 2
NO
Discussion (opens after you solve — no spoilers before)
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