#nullable enable

#region
using System.Numerics;

var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

const int MaxB = 1000000000;

static long Power(long v, long p, long mod)
{
    var (res, k) = (1L, v);
    while (p > 0)
    {
        if ((p & 1) > 0) res = res * k % mod;
        k = k * k % mod;
        p >>= 1;
    }
    return res;
}

var n = I<long>();
var m = I<long>();
var l = I<long>();

Console.WriteLine($"? {MaxB} 1");
var b0 = I<int>();
Console.WriteLine($"? {MaxB - b0 - 1} 1");
var b = I<int>() + 1;

if (b == 1)
{
    Console.WriteLine("! 0");
    return;
}
var ml = Power(m, l, b - 1);
if (ml == 0) ml = b - 1;
var ans = Power(n, ml, b);
Console.WriteLine($"! {ans}");