include

include

using namespace std;

int main() { int t; cin >> t;

while (t--) {
    int n;
    cin >> n;

    int count = 0;
    for (int i = 1; i <= n; i++) {
        if (i % 2 == 0) {
            count += i;
        } else {
            count -= i;
        }
    }

    cout << count << endl;
}

return 0;

}