Sum of Squares of Numbers

// sum of sqauares of numbers
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
     int n;
    cin>>n;
    cout<<(n*(n+1)*(2*n+1))/6;
    return 0;
}