#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

int main() {
  int n; cin >> n;
  auto fn = [&](V<> id) -> VV<> {
    VV<> v{id};
    while (id.size() >= 2) {
      int m = id.size();
      V<> nid;
      for (int i = 0; i < m; i += 2) {
        if (i + 1 < m) {
          cout << "? " << id[i] << ' ' << id[i + 1] << endl;
          int x; cin >> x;
          nid.push_back(x);
        } else nid.push_back(id[i]);
      }
      swap(id, nid);
      v.push_back(id);
    }
    return v;
  };
  V<> id(n);
  iota(begin(id), end(id), 1);
  auto v = fn(id);
  int x = v.back().back();
  V<>().swap(id);
  for (const auto& e : v) {
    int m = e.size();
    for (int i = 0; i < m; ++i) if (e[i] == x) {
      if ((i ^ 1) < m) id.push_back(e[i ^ 1]);
    }
  }
  int res = fn(id).back().back();
  cout << "! " << res << endl;
}