#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int L = 1000000;

int main() {
	int T; cin >> T;
	while (T--) {
		ll R1, R2;
		cout << "? " << L << ' ' << 0 << endl;
		cin >> R1;
		if (R1 == -1) return 0;
		cout << "? " << L << ' ' << L << endl;
		cin >> R2;
		if (R2 == -1) return 0;
		int N = (2 * R2 - 1) / (R2 - R1), st;
		cout << "! " << N << endl;
		cin >> st;
		if (st == -1) return 0;
	}
}