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https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=3301
#include <iostream>
using namespace std;
int ans1(int n) {
return n * (n + 1) * (2 * n + 1) / 6;
}
int ans2(int n) {
int sum = 0;
for (int i = 1; i <= n; i++) sum += i * i;
return sum;
}
int main() {
int n;
while (cin >> n) {
if (n == 0) break;
cout << ans2(n) << endl;
}
return 0;
}
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