#include<stdio.h>
int sum(int begin, int end)
{
	int sum = 0, i;
	for (i = begin; i <= end; i++)
		sum += i;
	return sum;
}
int main()
{
	int m;
	scanf("%d", &m);
	while (m--) {
		int N;
		scanf("%d", &N);
		if (N > 0)
			printf("%d\n", sum(N, 2*N));
		else
			printf("%d\n", sum(2*N, N));
	}
	return 0;
}