#include<bits/stdc++.h>
using namespace std;
int main() {
    int a=0,b,c=1;
    cin>>b;
    while(c<=b){
    	a=a+c*c;
    	c++;
    }
	cout<<a;
    return 0;
}
/**************************************************************
	Problem: 1054
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/