using System;

using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        new Magatro().Solve();
    }
}

public class Scanner
{
    private StreamReader Sr;

    private string[] S;
    private int Index;
    private const char Separator = ' ';

    public Scanner(Stream source)
    {
        Index = 0;
        S = new string[0];
        Sr = new StreamReader(source);
    }

    private string[] Line()
    {
        return Sr.ReadLine().Split(Separator);
    }

    public string Next()
    {
        string result;
        if (Index >= S.Length)
        {
            S = Line();
            Index = 0;
        }
        result = S[Index];
        Index++;
        return result;
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
    public decimal NextDecimal()
    {
        return decimal.Parse(Next());
    }
    public string[] StringArray(int index = 0)
    {
        Next();
        Index = S.Length;
        return S.Skip(index).ToArray();
    }
    public int[] IntArray(int index = 0)
    {
        return StringArray(index).Select(int.Parse).ToArray();
    }
    public long[] LongArray(int index = 0)
    {
        return StringArray(index).Select(long.Parse).ToArray();
    }
    public bool EndOfStream
    {
        get { return Sr.EndOfStream; }
    }
}

public class Magatro
{
    private Scanner Cin;

    private void Scan()
    {
        Cin = new Scanner(Console.OpenStandardInput());

    }
    public void Solve()
    {
        Scan();
        Console.WriteLine("? 64");
        int plus = -1;
        switch (Cin.Next())
        {
            case "0":
                Console.WriteLine("! 64");
                return;
            case "1":
                plus = int.MaxValue / 2;
                break;
            case "-1":
                plus = 64;
                break;
        }
        int length = 0;
        for (int i = 0; i < 100; i++)
        {
            Console.WriteLine("? {0}", Math.Max(length + plus-i-1,0));
            string s = Cin.Next();
            switch (s)
            {
                case "0":
                    Console.WriteLine("! {0}", length + plus-1);
                    return;
                    
                case "1":
                    length += plus;
                    break;
                case "-1":
                    break;
            }
            plus /= 2;
        }
    }
}