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

}

/**************************************************************
	Problem: 1553
	User: mc002
	Language: C++
	Result: Accepted
	Time:43 ms
	Memory:2072 kb
****************************************************************/