using System;

public class Hello
{
    static void Main()
    {
        var T = int.Parse(Console.ReadLine().Trim());
        while (T-- > 0)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            var n = int.Parse(line[0]);
            var m = int.Parse(line[1]);
            getAns(n, m);
        }
    }
    static void getAns(int n, int m)
    {
        var c = (n + 3) / 4;
        var nc = c * 8 - n;
        if (m <= nc) { Console.WriteLine(c); return; }
        Console.WriteLine((m - nc + 7) / 8 + c);
    }
}