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

/**************************************************************
	Problem: 1054
	User: hongjiaming
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/