using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Runtime.Intrinsics.Arm;

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 n = NN;
        if (n == 2)
        {
            var q = Que(1, 2);
            Ans(3 - q);
            return;
        }
        var lose = new int[n + 1];
        var list = new List<int>();
        for (var i = 1; i <= n; ++i) list.Add(i);
        while (list.Count > 1)
        {
            var nlist = new List<int>();
            for (var i = 0; i + 1 < list.Count; i += 2)
            {
                var win = Que(list[i], list[i + 1]);
                if (win == list[i]) lose[list[i + 1]] = list[i];
                else lose[list[i]] = list[i + 1];
                nlist.Add(win);
            }
            if (list.Count % 2 == 1) nlist.Add(list[^1]);
            list = nlist;
        }
        var llist = new List<int>();
        for (var i = 1; i <= n; ++i) if (lose[i] == list[0]) llist.Add(i);
        while (llist.Count > 1)
        {
            var nlist = new List<int>();
            for (var i = 0; i + 1 < llist.Count; i += 2)
            {
                nlist.Add(Que(llist[i], llist[i + 1]));
            }
            if (llist.Count % 2 == 1) nlist.Add(llist[^1]);
            llist = nlist;
        }
        Ans(llist[0]);
    }
    static int Que(int x, int y)
    {
        WriteLine($"? {x} {y}");
        return NN;
    }
    static void Ans(int x)
    {
        WriteLine($"! {x}");
    }
}