Sum of the First N Odd Numbers
Print 1 + 3 + 5 + … (N terms).
Input: one integer N.
Output: N².
Constraints:
- 1 ≤ N ≤ 109
Sample Tests
Input 1
3
Output 1
9
Input 2
1
Output 2
1
Discussion (opens after you solve — no spoilers before)
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