#include<bits/stdc++.h>
using namespace std;
int n,h;
int main(){
	cin>>n;
	while(n>=1){
		h=h+n*n;
		n--;
	}
	cout<<h;
	return 0;
}
/**************************************************************
	Problem: 1054
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/