#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int t;
  cin >> t;
  while (t--) {
    int n, m;
    cin >> n >> m;
    int a = (n + 3) / 4;
    int b = 8 * a - n;
    int c = max(m - b, 0);
    int d = (c + 7) / 8;
    cout << a + d << endl;
  }
  return 0;
}