#include <bits/stdc++.h>
using namespace std;
int main(){
	int m,n;
    cin>>n;
    for(int i=1;i<=n;i++){
        m=i*i+m;
    }
    cout<<m;
}
/**************************************************************
	Problem: 1553
	User: wangyiyang
	Language: C++
	Result: Wrong Answer
****************************************************************/