import java.util.Scanner;

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

		int ok = 1;
		int ng = n;
		for (int i = 0; i < 10; i++) {
			int mid = (ok + ng) / 2;
			System.out.println("? " + mid);
			int in = sc.nextInt();
			if (mid <= in) {
				ok = mid;
			} else {
				ng = mid;
			}
		}
		System.out.println("Yes " + ok + " " + ng);
		sc.close();
	}
}