package con_level_1;
import java.util.Scanner;

public class Con820 {
	public static void main(String[] args){
		Scanner s = new Scanner(System.in);
		int N = s.nextInt() , K = s.nextInt();
		s.close();

		if(N >= K){
			double n = Math.pow(2, N) , k = Math.pow(2, K);
			System.out.println((int)(n / k));

		}else{
			System.out.println(0);
		}
	}
}