using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = int.Parse(line[1]);
        getAns(n, m);
    }
    static void getAns(int n, int m)
    {
        var count = 0;
        long ans = m;
        while (m > 1)
        {
            m = m % 2 == 0 ? m / 2 : (m + 1) / 2;
            ans += m;
            count++;
        }
        ans += n - count - 1;
        Console.WriteLine(ans);
    }
}