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

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