#include <bits/stdc++.h>
using namespace std;
#define int              long long int
#define double           long double
#define print(a)         for(auto x : a) cout << x << " "; cout << endl


const int M = 1000000007;
const int N = 3e5+9;
const int INF = 2e9+1;
const int LINF = 2000000000000000001;

inline int power(int a, int b, int mod=M) {
    int x = 1;
    a %= mod;
    while (b) {
        if (b & 1) x = (x * a) % mod; 
        a = (a * a) % mod;
        b >>= 1;
    }
    return x;
}


//_ ***************************** START Below *******************************

 //* Change this to false => before submitting to cf
bool testing = true; 

int n = 10;
vector<int> toGuess = {2, 4, 6, 7, 9, 10};

bool  interactor(int query){
    auto it = lower_bound(begin(toGuess), end(toGuess), query);

    if(it != toGuess.end() && *it == query ) return true;
    return false; 
}

bool askQuery(int x){
    cout << "? " << x << endl;

    //* Custom interactor for testing ourself
    if(testing){
        cout << interactor(x) << endl;
        return interactor(x);
    }

    //* Codeforces Judge interacts 
    int yesNo;
    cin >> yesNo;
    return yesNo;

}


int consistency(){



    //* seed random with random_device
    // random_device rd;
    // mt19937 gen(rd());

    //* seed random with system clock
    mt19937 gen(chrono::steady_clock::now().time_since_epoch().count());

    uniform_int_distribution<> distrib(1, n);


    for(int i=1; i<=100; i++){

        int randIndx = distrib(gen);

        if(askQuery(randIndx) == true) return randIndx;
    }

}








void solve() {
	//* String buffer issue in interactive 
    // cout << "! " << consistency() << endl;
    
    int ans = consistency();
    cout << "! " << ans << endl;

}





int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    solve();

    return 0;
}