#include <bits/stdc++.h>
using namespace std;

void mainSolve()
{
  int n;
  cin >> n;
  int ans = (n % 2 == 0) ? n / 2 : -(n + 1) / 2;
  cout << ans << endl;
}

int main()
{
  int t;
  cin >> t;
  while (t--)
  {
    mainSolve();
  }
  return 0;
}