import java.util.*;

public class Exercise91{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int l = sc.nextInt();
    int n = sc.nextInt();

    int x = l - 3;
    int y = (int)Math.pow((double)2, (double)x);
    System.out.println(y * n);
  }
}