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