#include <iostream>
using namespace std;
int ask(int Y){
	cout << "? " << Y << endl;
	int res;
	cin >> res;
	return res;
}
int main(){
	int res = 123;
	for(int i=0;i<100;i++){
		int Y = rand() % 10000;
		if(ask(Y) == 0){
			res = 456;
			break;
		}
	}
	cout << "! " << res << endl;
	return 0;
}