import java.util.*;

class Main{
    public static void main (String[] args) {
        
        Scanner s = new Scanner(System.in);
        int a =s.nextInt();
        int b =s.nextInt();
            int n = (int)Math.pow(2,a);
            int m = (int)Math.pow(2,b);
            int t = m/n;
            if(n>m){
                System.out.println(0);
            }else{
                System.out.println(t);
            }
    }
}