#include<bits/stdc++.h>
using namespace std;
int main()
{
	
	int n,sum=0;
	cin>>n;
  
  	int i=1;
	while(i<=n){
   		sum+=i*i;
   		
   		i++;
	}    
	cout<<sum<<endl;
	return 0;
}

/**************************************************************
	Problem: 1054
	User: czr
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/