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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var num = int.Parse(Console.ReadLine());
            var biscuits = 1;
            var tataitaKazu = 0;

            while (true)
            {
                if (biscuits >= num)
                {
                    break;
                }
                // 叩く
                tataitaKazu++;

                // ビスケット
                biscuits *= 2;
            }

            Console.WriteLine(tataitaKazu);
        }
    }
}