using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Int64 N = Int64.Parse(Console.ReadLine());
            Int64 X = 1;
            Int64 time = 0;
            if (N == 0)
            {
                Console.WriteLine(1);
                return;
            }
            if (N == 1)
            {
                Console.WriteLine(0);
                return;
            }

            while(N > X)
            {
                X = X << 1;
                time++;
            }

            time += X - N;
            Console.WriteLine(time);
        }
    }
}