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

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = long.Parse(line[1]);
        getAns(n, m);
    }
    static void getAns(int n, long m)
    {
        var ans = new List<long>();
        ans.Add(m);
        while (m > 1)
        {
            m = m % 2 == 0 ? m / 2 : (m + 1) / 2;
            ans.Add(m);
        }
        if (ans.Count > n)
        {
            var ans2 = ans.OrderBy(x => x).Take(n).Sum();
            Console.WriteLine(ans2);
            return;
        }
        var res = ans.Sum();
        res += n - ans.Count;
        Console.WriteLine(res);
    }
}