# 28. Sum of Squares with Recursion

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

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

## Limits

$n$ 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 $n$.

 5

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