#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    
    int sum = 0;
    for (int i = 1; i <= n; i++) {
        sum += i * i;
    }
    
    cout << sum << endl;
    return 0;
}
/**************************************************************
	Problem: 1054
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/