package algo;

import java.util.Scanner;

public class sample7 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int K = sc.nextInt();
		
		if(Math.pow(2, N) >= (Math.pow(2, K))) {
			System.out.println((int)((Math.pow(2, N)) / (Math.pow(2, K))));
		}
		else {
			System.out.println(0);
		}
	}
}