#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n = 0;
    for (int i = 29; i >= 0; i--) {
        cout << "? " << n + (1 << i) << endl;
        int ans;
        cin >> ans;
        n += ans * (1 << i);
    }
    cout << "! " << n << endl;
}