import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		ArrayDeque<Integer> que = new ArrayDeque<>();
		for (int i = 1; i <= N; ++i)
			que.addLast(i);
		while (que.size() > 1) {
			ArrayDeque<Integer> next = new ArrayDeque<>();
			while (!que.isEmpty()) {
				if (que.size() >= 2) {
					System.out.println("? " + que.pop() + " " + que.pop());
					int ans = sc.nextInt();
					next.add(ans);
				} else if (que.size() == 1) {
					next.add(que.pop());
				}
			}
			que = next;
		}
		int first=que.pop();
		for(int i=1;i<=N;++i) {
			if(i!=first) {
				que.addLast(i);
			}
		}
		
		while (que.size() > 1) {
			ArrayDeque<Integer> next = new ArrayDeque<>();
			while (!que.isEmpty()) {
				if (que.size() >= 2) {
					System.out.println("? " + que.pop() + " " + que.pop());
					int ans = sc.nextInt();
					next.add(ans);
				} else if (que.size() == 1) {
					next.add(que.pop());
				}
			}
			que = next;
		}
		int second=que.pop();
		System.out.println("! " + second);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}