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