using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Int64 N = Int64.Parse(Console.ReadLine());
            Int64 time = 0;
            while(N != 1)
            {
                time++;
                if ((N & 0x01) == 1)
                {
                    N++;
                } else
                {
                    N = N >> 1;
                }
            }
            Console.WriteLine(time);
        }
    }
}