#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
int main(void){
    int t;
    cin>>t;
    while(t--){
        long long a,b;
        cout<<"? 1000000 1000000"<<endl;
        cin>>a;
        if(a==-1)return 1;
        cout<<"? 1000000 0"<<endl;
        cin>>b;
        if(b==-1)return 1;
        long long val=a-b;
        if(val==1){
            cout<<"! 1"<<endl;
            continue;
        }
        
        vector<long long>ans;
        for(long long i=2*b/(val+1)+1;i<=2*b/(val-1)+1;i++){
            if(i>1e6)break;
            long long tmp=(1000000*i)/val;
            if(tmp==0||tmp>1e6)continue;
            if(i*1000000/tmp!=val)continue;
            if(floor_sum(i,tmp,1000000,0)!=b)continue;
            ans.push_back(i);
        }
        if(ans.size()==1){
            cout<<"! "<<ans[0]<<endl;
        }else{
            for(int i=0;i<ans.size();i++){
               cerr<<ans[i]<<" ";
            }
            cerr<<endl;
            return 1;
        }
    }
    return 0;
}