#include <iostream>
using namespace std;
int main()
{
	int n,i=1,c=0;
	cin >> n;
	while(i<=n)
	{
		c=c+i*i;
		i++;
	}
	cout << c << endl;
}
/**************************************************************
	Problem: 1054
	User: xiaomingze
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/