using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        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);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}