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

namespace foryuki
{
    class Program
    {
        static void Main(string[] args)
        {
            long N = long.Parse(Console.ReadLine());
            long m = 1;
            long cnt = 1;

            while (m < N)
            {
                long bit = Convert.ToString(m, 2).Where(x => x == '1').Count();
                m += bit;
                cnt++;
            }

            if (m < N)
            {
                Console.WriteLine(-1);
            }
            else
            {
                Console.WriteLine(cnt);
            }

        }

        //-------------------------------------------------------------

        static int[] ConvertStringArrayToIntArray(string[] array)
        {
            return Array.ConvertAll(array, str => int.Parse(str));
        }

        static List<int> ConvertStringArrayToIntList(string[] str)
        {
            var list = new List<int>();
            foreach (var c in str) list.Add(int.Parse(c));
            return list;
        }
    }
}