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

/**************************************************************
	Problem: 1054
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/