import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int length = sc.nextInt();
		int n = sc.nextInt();
		System.out.println(pow(2, length - 3) * n);
	}
	
	static long pow(long n, long p) {
	    if (p == 0) {
	        return 1;
	    } else if (p % 2 == 0) {
	        return pow(n * n, p / 2);
	    } else {
	        return n * pow(n, p - 1);
	    }
	}
}