#include <bits/stdc++.h>
using namespace std;
int n,m;
int main(){
	cin>>n;
for(int i=1;i<=n;i++){
	m=i*i+m;
}
cout<<m;
    return 0;
}
/**************************************************************
	Problem: 1553
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:50 ms
	Memory:2072 kb
****************************************************************/