using System;

namespace Yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int a = 1;
            int c = 0;
            while (a < n)
            {
                a = a << 1;
                c++;
            }

            Console.WriteLine(c);
            Console.ReadLine();
        }
    }
}