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

public class Main {
	public static void main(String[] args) {
		BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
		try {
			int L = Integer.parseInt(read.readLine());
			int N = Integer.parseInt(read.readLine());
			read.readLine();

			System.out.println((long) (Math.pow(2, (L - 3)) * N));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}