using System;
using System.Collections.Generic;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
#if LocalDebug
            var exStdIn = new System.IO.StreamReader("stdin.txt");
            System.Console.SetIn(exStdIn);
#endif
            var Goal = GetData();
            var Cnt = 0;
            var Num = 1;

            while(true)
            {
                if(Num > Goal)
                {
                    break;
                }
                else if (Num == Goal)
                {
                    break;
                }

                Num *= 2;
                Cnt++;
            }
            Console.WriteLine(Cnt);

#if LocalDebug
            System.Console.ReadKey();
#endif
        }


        static int GetData()
        {
            return int.Parse(Console.ReadLine());
        }



    }
}