using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int need = int.Parse(Console.ReadLine());
        int biscuit = 1;
        int clapCnt = 0;

        while (need > biscuit)
        {
            biscuit *= 2;
            clapCnt++;
        }

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