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()
    {
        {
            WriteLine("? 1 1");
            var s = ReadLine();
            if (s == "<")
            {
                WriteLine($"! 0");
                return;
            }
            if (s == ">")
            {
                WriteLine($"? 0 0");
                ReadLine();
            }
        }
        var len = 100;
        var ng = new HugeInt(len);
        ng.Digits[0] = 1;
        var ok = new HugeInt(len);
        ok.Digits[len - 1] = 1;
        // ok - ng > 1
        while (ok.IsLarge(HugeInt.Sum(ng, 1)))
        {
            var mid = HugeInt.Div(HugeInt.Sum(ok, ng), 2);
            WriteLine($"? 1 {mid}");
            var s = ReadLine();
            if (s == "<") ok = mid;
            else if (s == "=")
            {
                WriteLine($"! {mid}");
                return;
            }
            else
            {
                ng = mid;
                WriteLine($"? 0 0 ");
                ReadLine();
            }
        }
        WriteLine($"! {HugeInt.Rem(ok, 1)}");
    }
    class HugeInt
    {
        public List<int> Digits;
        public HugeInt(int length)
        {
            Digits = new List<int>(length);
            for (var i = 0; i < length; ++i) Digits.Add(0);
        }
        public bool IsLarge(HugeInt b)
        {
            for (var i = Digits.Count - 1; i >= 0; --i)
            {
                if (Digits[i] > b.Digits[i]) return true;
                if (Digits[i] < b.Digits[i]) return false;
            }
            return false;
        }
        public override string ToString()
        {
            var c = new List<char>(Digits.Count);
            var flg = false;
            for (var i = Digits.Count - 1; i >= 0; --i)
            {
                if (Digits[i] > 0) flg = true;
                if (flg) c.Add((char)(Digits[i] + '0'));
            }
            return string.Concat(c);
        }
        public static HugeInt Sum(HugeInt a, int b)
        {
            var ans = new HugeInt(a.Digits.Count);
            var add = b;
            for (var i = 0; i < a.Digits.Count; ++i)
            {
                var sum = a.Digits[i] + add;
                ans.Digits[i] = sum % 10;
                add = sum / 10;
            }
            return ans;
        }
        public static HugeInt Rem(HugeInt a, int b)
        {
            var ans = new HugeInt(a.Digits.Count);
            for (var i = 0; i < a.Digits.Count; ++i) ans.Digits[i] = a.Digits[i];
            ans.Digits[0] -= b;
            for (var i = 0; i < ans.Digits.Count; ++i)
            {
                if (ans.Digits[i] < 0)
                {
                    var d = ans.Digits[i] / 10;
                    ans.Digits[i] += d * 10;
                    if (ans.Digits[i] < 0)
                    {
                        ++d;
                        ans.Digits[i] += 10;
                    }
                    ans.Digits[i + 1] -= d;
                }
            }
            return ans;
        }
        public static HugeInt Sum(HugeInt a, HugeInt b)
        {
            var ans = new HugeInt(a.Digits.Count);
            var add = 0;
            for (var i = 0; i < a.Digits.Count; ++i)
            {
                var sum = a.Digits[i] + b.Digits[i] + add;
                ans.Digits[i] = sum % 10;
                add = sum / 10;
            }
            return ans;
        }
        public static HugeInt Div(HugeInt a, int d)
        {
            var ans = new HugeInt(a.Digits.Count);
            var rem = 0;
            for (var i = a.Digits.Count - 1; i >= 0; --i)
            {
                rem = rem * 10 + a.Digits[i];
                ans.Digits[i] = rem / d;
                rem = rem % d;
            }
            return ans;
        }
    }
}