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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
           int n=int.Parse(Console.ReadLine());
           if (n % 2 == 1)
               Console.Write(0);
           else
           {
               List<int> l = new List<int>();

               while (n != 0)
               {
                   n = n / 2;
                   l.Add(n % 2);
               }
               for (int i = 0; i < l.Count; i++)
                   if (l[i] == 1)
                   {
                       Console.Write(i + 1);
                       break;
                   }
           }

        }
    }
}