using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var rest = n;
        var ans = 0L;
        var cur = m;
        while (cur > 1)
        {
            --rest;
            ans += cur;
            cur = (cur + 1) / 2;
        }
        if (rest > 0)
        {
            WriteLine(ans + rest);
        }
        else
        {
            WriteLine((1 << n) - 1);
        }
    }
}