#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,h=0;
	cin>>n;
	for (int i=1;i<=n;i++){
		h+=i*i;
	}
	cout<<h<<endl;
}
/**************************************************************
	Problem: 1553
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:52 ms
	Memory:2072 kb
****************************************************************/