using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            Console.WriteLine("{0}", Count(N));
            Console.ReadLine();

        }

        static int Count(int n)
        {
            int c = 0;
            int have = 1;
            int P = 0; ;
            while(have < n)
            {
                have--;
                P = 1;
                while (have + P < n)
                {
                    P = P * 2;
                    c++;
                }
                have += P;
                
            }
            return c;


        }
    }
}