using System;

namespace _642
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            long x = 1;
            int ret = 0;
            while (n > x)
            {
                x *= 2;
                ret++;
            }
            Console.WriteLine(ret + x - n);
        }
    }
}