/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Long n = Long.parseLong(br.readLine());
        Long m = Long.parseLong(br.readLine());
        System.out.println((long)Math.pow(2,n-3)*m);
        
    }

}