#include<iostream>

using namespace std;

int main() {
	
	int n;
	cin >> n;
	
	while (n -- ) {
		int x;
		cin >> x;
		int sum = 0;
		if (x >= 0) {
			for (int i = x; i <= 2 * x; i ++ ) {
				sum += i;
			}
		} else {
			for (int i = 2 * x; i <= x; i ++ ) {
				sum += i;
			}
		}
		cout << sum << endl;
	}

	return 0;
}