import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();

		Set<Integer> set = new HashSet<>();
		for (int i = 1; i <= n; i++) {
			set.add(i);
		}

		Map<Integer, List<Integer>> map = new HashMap<>();
		while (set.size() > 1) {
			Set<Integer> set2 = new HashSet<>();
			Integer[] arr = set.toArray(new Integer[0]);
			for (int i = 0; i < arr.length; i+=2) {
				if (i == arr.length - 1) {
					set2.add(arr[i]);
				} else {
					System.out.println("? " + arr[i] + " " + arr[i + 1]);
					int z = sc.nextInt();
					set2.add(z);
					List<Integer> list = map.get(z);
					if (list == null) {
						list = new ArrayList<>();
						map.put(z, list);
					}
					list.add(arr[i] == z ? arr[i + 1] : arr[i]);
				}
			}
			set = set2;
		}

		int f = set.iterator().next();
		set = new HashSet<>();
		set.addAll(map.get(f));
		while (set.size() > 1) {
			Set<Integer> set2 = new HashSet<>();
			Integer[] arr = set.toArray(new Integer[0]);
			for (int i = 0; i < arr.length; i+=2) {
				if (i == arr.length - 1) {
					set2.add(arr[i]);
				} else {
					System.out.println("? " + arr[i] + " " + arr[i + 1]);
					int z = sc.nextInt();
					set2.add(z);
				}
			}
			set = set2;
		}
		sc.close();
		System.out.println("! " + set.iterator().next());
	}
}