Sum of Squares

Given a non-negative integer n, compute the sum of the squares of every integer from 1 to n:

1^2 + 2^2 + 3^2 + ... + n^2

Input

$1 is the path to a file containing a single line with n.

Example:

5

Output

A single integer: the sum of squares from 1 to n.

For the example above:

55

(1 + 4 + 9 + 16 + 25 = 55)

Constraints

• n is an integer in [0, 100000].
• If n is 0, the sum is 0.