#ifdef DEBUG_IS_VALID #define DEB 1 #define _LIBCPP_DEBUG 0 #else #define DEB 0 #define NDEBUG #endif #include using namespace std; #define ALL(g) (g).begin(),(g).end() #define REP(i, x, n) for(int i = x; i < n; i++) #define rep(i,n) REP(i,0,n) #define RREP(i, x, n) for(int i = x; i >= n; i--) #define rrep(i, n) RREP(i,n,0) #define pb push_back #pragma GCC optimize ("-O3") using namespace std; #define DUMPOUT cout #define dump(...) if(DEB) DUMPOUT<<" "<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<ostream& operator << (ostream& os, pair p){cout << "(" << p.first << ", " << p.second << ")"; return os;} templateostream& operator << (ostream& os, vector& vec) { os << "{"; for (int i = 0; iostream& operator << (ostream& os, set& st){cout << "{"; for(auto itr = st.begin(); itr != st.end(); itr++) cout << *itr << (next(itr)!=st.end() ? ", " : ""); cout << "}"; return os;} templateostream& operator << (ostream& os, map mp){cout << "{"; for(auto itr = mp.begin(); itr != mp.end(); itr++) cout << "(" << (itr->first) << ", " << (itr->second) << ")" << (next(itr)!=mp.end() ? "," : ""); cout << "}"; return os; } void dump_func(){DUMPOUT << endl;} template void dump_func(Head&& head, Tail&&... tail){ DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...);} template inline bool chmax(T& a,T const& b){if(a>=b) return false; a=b; return true;} template inline bool chmin(T& a,T const& b){if(a<=b) return false; a=b; return true;} using ll = long long; using P = pair; using Pl = pair; using vi = vector; using vvi = vector; using vl = vector; using vvl = vector; using vp = vector; using vvp = vector; const int INF = 1<<29; const long long LINF=1LL<<59; int main(){ auto tourn = [&](vi x){ while(x.size()>1){ vi nxt; dump(x); rep(i,x.size()/2){ std::cout << "? " << x[2*i]+1 << " " << x[2*i+1]+1 << endl; int res; cin >> res ; res--; nxt.pb(res); } if(x.size()%2) nxt.pb(x.back()); swap(x,nxt); } return x[0]; }; int N; cin >> N ; vi now(N); rep(i,N) now[i] = i; int wi = tourn(now); now.erase(now.begin()+wi); int ans = tourn(now); cout << "! " << ans+1 << endl; return 0; }