#include <bits/stdc++.h>
using namespace std;
template <typename T1, typename T2>
string print_iterable(T1 begin_iter, T2 end_iter, int counter) {
  bool done_something = false;
  stringstream res;
  res << "[";
  for (; begin_iter != end_iter and counter; ++begin_iter) {
    done_something = true;
    counter--;
    res << *begin_iter << ", ";
  }
  string str = res.str();
  if (done_something) {
    str.pop_back();
    str.pop_back();
  }
  str += "]";
  return str;
}
vector<int> SortIndex(int size, std::function<bool(int, int)> compare) {
  vector<int> ord(size);
  for (int i = 0; i < size; i++) ord[i] = i;
  sort(ord.begin(), ord.end(), compare);
  return ord;
}
template <typename T>
bool MinPlace(T& a, const T& b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
bool MaxPlace(T& a, const T& b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <typename S, typename T>
ostream& operator<<(ostream& out, const pair<S, T>& p) {
  out << "{" << p.first << ", " << p.second << "}";
  return out;
}
template <typename T>
ostream& operator<<(ostream& out, const vector<T>& v) {
  out << "[";
  for (int i = 0; i < (int)v.size(); i++) {
    out << v[i];
    if (i != (int)v.size() - 1) out << ", ";
  }
  out << "]";
  return out;
}
const int MAXN = -1;
vector<int> diff = {0, 6, 9, 15};
vector<int> cost = {0, 1, 1, 2};
int GetAns(int x) {
  if (x % 4 == 0) return x / 4;
  for (int i = 0; i < (int)diff.size(); i++) {
    int d = diff[i];
    int c = cost[i];
    if (x >= d and x % 4 == d % 4) return c + (x - d) / 4;
  }
  return -1;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int Q;
  cin >> Q;
  for (int i = 0; i < Q; i++) {
    int x;
    cin >> x;
    cout << GetAns(x) << "\n";
  }
}
