#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;

const int MIN_N = 3;
const int MAX_N = 51;


int main() {
    registerValidation();
    int N = inf.readInt(MIN_N, MAX_N);
    inf.readEoln();
    cout << "? " << 0 << " " << 1 << endl;
    int p;
    cin >> p;
    cout << "! " << 0 << endl;
    inf.readEof();
}