#include <bits/stdc++.h>
using namespace std;
long long const mod = 1000000007;
long long const md = 998244353;
long long mypow(long long a, long long b) {
  long long res = 1;
  a %= mod;
  assert(b >= 0);
  for (; b; b >>= 1) {
    if (b & 1) res = res * a % mod;
    a = a * a % mod;
  }
  return res;
}
ifstream in("txt.in");
ofstream out("txt.out");
int f[20];
int main() {
  cout << fixed << setprecision(12);
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout.tie(0);
  long long t;
  cin >> t;
  f[1] = -1;
  f[3] = -1;
  f[5] = -1;
  f[8] = 2;
  f[9] = 1;
  f[11] = -1;
  f[13] = 2;
  f[16] = 4;
  f[2] = -1;
  f[4] = 1;
  f[6] = 1;
  f[7] = -1;
  f[10] = 2;
  f[12] = 3;
  f[14] = 3;
  f[15] = 2;
  f[17] = 3;
  while (t--) {
    long long x;
    cin >> x;
    if (x <= 17)
      cout << f[x] << '\n';
    else {
      long long u = x / 4;
      long long k = x % 4;
      while (f[k] <= 0) {
        --u;
        k += 4;
      }
      cout << u + f[k] << '\n';
    }
  }
  return 0;
}
