#include<bits/stdc++.h>
using namespace std;
int main(){
int i,n,s=0;
cin>>i;
for(n=1;n<=i;n++)
s=s+n*n;
cout<<s;
return 0;}
/**************************************************************
	Problem: 1054
	User: hongjiaming
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/