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

namespace ConsoleProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int Biscket_num = 1;
            int HandNum = 0;
            int PocketNum = 1;
            int count = 0;
            while(Biscket_num != N)
            {
                while((PocketNum * 2)+ HandNum > N )
                {
                    PocketNum--;
                    HandNum++;
                }
                PocketNum *= 2;
                Biscket_num = PocketNum + HandNum;
                count++;
            }
            Console.WriteLine("{0}",count);

        }
   }
}