#include <algorithm>
#include <iostream>
#include <numeric>
#include <vector>

using namespace std;

int main() {
  int N;
  cin >> N;
  vector<int> a(N);
  iota(a.begin(), a.end(), 1);
  nth_element(a.begin(), a.begin() + 1, a.end(), [](const int a, const int b) {
    cout << "? " << a << " " << b << endl;
    int res;
    cin >> res;
    return (res == a);
  });
  cout << "! " << a[1] << endl;
  return 0;
}