#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int q;
  cin >> q;
  while (q--) {
    int n;
    cin >> n;
    int dp[16];
    int a[3] = {4, 6, 9};
    for (int i = 1; i < 16; i++) dp[i] = -1;
    dp[0] = 0;
    for (int i = 1; i < 16; i++) {
      for (int k = 0; k < 3; k++) {
        int j = a[k];
        if (i >= j && dp[i - j] != -1) {
          dp[i] = max(dp[i], dp[i - j] + 1);
        }
      }
    }
    if (n < 16)
      cout << dp[n] << "\n";
    else {
      int t = (n - 16) / 4 + 1;
      cout << t + dp[n - 4 * t] << "\n";
    }
  }
  return 0;
}
