#include using namespace std; #define rep(i, n) for (ll i = 0; i < (ll)(n); i++) #define all(x) (x).begin(), (x).end() using ll = long long; const ll MOD = 998244353; #include using namespace atcoder; using mint = modint998244353; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); cout<<"?"<<" "<<1<1){ if(f==0){ cout<<"?"<<" "<>x; if(x==1){ r=(r+l)/2+1; }else{ l=(r+l)/2; f=1; } }else{ cout<<"?"<<" "<>x; if(x==1){ r=(r+l)/2+1; f=0; }else{ l=(r+l)/2; } } } cout<<"!"<<" "<