using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        this.Target = long.Parse(Reader.ReadLine());
        long ans = GetAns(this.Target, 0);
        Console.WriteLine(ans);
    }

    private long GetAns(long num, long subTotal) {
        if(num==1) {
            return 0;
        }
        long ans = long.MaxValue;
        if(num%2==0) {
            ans = GetAns(num / 2, subTotal + 1) + 1;
        } else {
            ans = GetAns(num + 1, subTotal + 1) + 1;
        }
        return ans;
    }

    private long Target;


    public class Reader
    {
        private static StringReader sr;
        public static bool IsDebug = false;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (sr == null)
                {
                    sr = new StringReader(InputText.Trim());
                }
                return sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        private static string InputText = @"

499211612


";
    }

    public static void Main(string[] args)
    {
#if DEBUG
        Reader.IsDebug = true;
#endif
        Program prg = new Program();
        prg.Proc();
    }
}