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 n = NN;
        var a1 = Question(1);
        var left = 1;
        var right = n + 1;
        while (right - left > 1)
        {
            var center = (left + right) / 2;
            if (center == n) break;
            var ac = Question(center);
            if (ac == 0)
            {
                if (center > n / 2) Answer(1, center);
                else Answer(center + 1, n);
                return;
            }
            if ((ac > 0) == (a1 > 0)) left = center;
            else right = center;
        }
        Answer(2, n - 1);
    }
    static int Question(int k)
    {
        WriteLine($"? {k}");
        return NN * 2 - k;
    }
    static void Answer(int l, int r)
    {
        WriteLine($"! {l} {r}");
    }
}