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

namespace poketto
{
    class Program
    {
        static void Main(string[] args)
        {
            var str0 = long.Parse(Console.ReadLine());
            double syou = (double)str0;
            var kotae = 0;
            var kisuu = false;

            do
            {

                if (syou % 2 != 0)
                {
                    kisuu = true;
                }
                syou = syou / 2.0;

                kotae++;

            } while ( 2.0 <= syou );

            if (kisuu)
            {
                kotae++;
            }
            if (str0 == 1)
            {
                kotae = 0;
            }

            Console.WriteLine(kotae);
        }
    }
}