import java.util.*;

public class Main {
    static TreeSet<Integer> primes;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k = sc.nextInt();
		double max = Math.pow(2, n);
		double unit = Math.pow(2, k);
	    System.out.println((long)(max / unit));
	}
}