import java.io.BufferedReader;
import java.io.InputStreamReader;

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