using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());

        int biscket = 1;
        int cnt = 0;

        while (biscket!=N)
        {
            if (N - biscket < biscket)
            { cnt++; break; }

            biscket *= 2;
            cnt++;
        }

        Console.WriteLine(cnt);
    }
}