Sum of Cubes
Print 1³ + 2³ + … + N³.
Input: one integer N.
Output: (N(N+1)/2)² — the square of the triangular number.
Constraints:
- 1 ≤ N ≤ 109
Sample Tests
Input 1
3
Output 1
36
Input 2
1
Output 2
1
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