using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        int L = int.Parse(Console.ReadLine());
        int N = int.Parse(Console.ReadLine());
        string[] S = Console.ReadLine().Split(' ');

        Console.WriteLine(Math.Pow(2, (L - 3)) * N);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}