#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)

using namespace std;
using ll = long long;

int cnt;
#ifdef DEBUG
int a[300];
bool lt(int x, int y) {
  cnt++;
  return a[x] > a[y];
}
#else
bool lt(int x, int y) {
  cnt++;
  cout << "? " << x+1 << ' ' << y+1 << endl;
  int res;
  cin >> res;
  return res == y+1 ? 1 : 0;
}
#endif

int main() {
  // cin.tie(nullptr);
  // ios::sync_with_stdio(false);
#ifdef DEBUG
  rep(i, 300) a[i] = i;
  int n = 300;
#else
  int n;
  cin >> n;
#endif
  vector<int> ord(n);
  rep(i, n) ord[i] = i;
  mt19937 mt(time(NULL));
  for (int i = 0; i < n; i++) {
    int r = uniform_int_distribution<int>(0, i)(mt);
    swap(ord[i], ord[r]);
  }
  int first, second;
  if (lt(ord[0], ord[1])) {
    first = ord[1];
    second = ord[0];
  } else {
    first = ord[0];
    second = ord[1];
  }
  for (int i = 2; i < n; i++) {
    if (lt(ord[i], second)) {
    } else if (lt(ord[i], first)) {
      second = ord[i];
    } else {
      second = first;
      first = ord[i];
    }
  }
  assert(n <= 290);
  cout << "! " << second+1 << endl;
  cerr << cnt << endl;
}