#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,n,a=0;
	i=1;
	cin>>n;
	while(i<=n){a=a+i*i;i++;}
	cout<<a; 
	return 0;
	}

/**************************************************************
	Problem: 1054
	User: ljl2
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/