using System;
using System.Collections.Generic;
using System.Linq;

// https://yukicoder.me/problems/no/2921
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("5");
            WillReturn.Add("6 7");
            WillReturn.Add("5 14");
            WillReturn.Add("18 6");
            WillReturn.Add("1 18");
            WillReturn.Add("9 17");
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("6");
            WillReturn.Add("7764 52463");
            WillReturn.Add("1658 7836");
            WillReturn.Add("657456 647734");
            WillReturn.Add("64567 734634");
            WillReturn.Add("476 857467");
            WillReturn.Add("48756587 675761");
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        long[] wkArr = { };
        Action<string> SplitAct = pStr =>
            wkArr = pStr.Split(' ').Select(pX => long.Parse(pX)).ToArray();

        foreach (string EachStr in InputList.Skip(1)) {
            SplitAct(EachStr);
            Solve(wkArr[0], wkArr[1]);
        }
    }

    static void Solve(long pN, long pM)
    {
        long NeedTukue = pN / 4;
        if (pN % 4 > 0) {
            NeedTukue++;
        }

        long RestSeat = NeedTukue * 8 - pN;
        pM -= RestSeat;

        if (pM > 0) {
            NeedTukue += pM / 8;
            if (pM % 8 > 0) {
                NeedTukue++;
            }
        }
        Console.WriteLine(NeedTukue);
    }
}