Uva 12149 Solution

#include<bits/stdc++.h>
#define ll unsigned long long int
using namespace std;
int main()
{
    ll n, m;
    while(cin >> n && n > 0)
    {
        m = (n*(n+1)*(2*n+1))/6;
        cout << m << endl;
    }

    return 0;
}