using System;

namespace y
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int c = 0;
            while (n > 1)
            {
                c++;
                if (n % 2 == 1) n++;
                else n /= 2;
            }
            Console.WriteLine(c);
        }
    }
}