Sum of cubes#10683
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Sum of cubes

1 second
128 megabytes
Very easy

Given a positive integer . Compute the sum of cubes of the first positive integers:

1^3 + 2^3 + 3^3 + \dots + n^3

Input

One positive integer n~(1 \le n \le 10000).

Output

Print the value of the given sum.

Examples

Example 1

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