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

class Main175 {
	
	public static void out (Object out) {
		System.out.println(out);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int l = Integer.parseInt(br.readLine());
		int n = Integer.parseInt(br.readLine());
		br.readLine();
		
		out((int)Math.pow(2, l - 3) * n);
		
	}
}