using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new int[t];
        for (var u = 0; u < t; ++u)
        {
            var c = NList;
            var (n, m) = (c[0], c[1]);
            var edge = (n + 3) / 4;
            var center = edge * 4 + (4 - n % 4) % 4;
            if (center >= m) ans[u] = edge;
            else ans[u] = edge + (m - center + 7) / 8;
        }
        WriteLine(string.Join("\n", ans));
    }
}