#include <bits/stdc++.h> 
using namespace std;
int main(){
	int i=1,z,h=0,p;
	cin>>z;
	while(i<=z){
		p=i*i;
		h=h+p;
		i++;
	}cout<<h;
}
/**************************************************************
	Problem: 1054
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/