UVa 12149 - Feynman

// UVa 12149 - Feynman

#include <iostream>
using namespace std;

int main() {
	unsigned long long int T[101];
	for (int n = 1; n <= 100; n++) {
		T[n] = 0;
		for (int i = 1; i <= n; i++)
			T[n] += (n - i + 1) * (n - i + 1);
	}
	int n;
	while ((cin >> n) && (n))
		cout << T[n] << endl;
	return 0;
}