#include<iostream>

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: ct001
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/