28. Sum of Squares with Recursion

I'm a slow walker, but I never walk backwards.

Task Description

Write a program to compute the sum of squares from $1$ to $n$ with a recursive function. You should NOT use loops.


$n$ is positive and no more than $1000$.

Input Format

There are one line in the input. The first line has $n$.

Output Format

There are one lines in the output. The first line has the sum of squares from 1 to $n$.

Sample Input


Sample Output