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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            List<int> queue = new List<int>();
            List<int> al = new List<int>();
            List<int> visit = new List<int>();
            int R = 1;
            al.Add(R);
            queue.Add(R);
            visit.Add(R);
            while (queue.Contains(R) && (R != N || al.Count != 0))
            {
                bool exist = false;
                string strR = Convert.ToString(R, 2);
                char[] cR = new char[strR.Length];
                for (int i = 0; i < strR.Length; i++)
                {
                    cR[i] = strR[i];
                }
                int count = 0;
                for (int i = 0; i < cR.Length; i++)
                {
                    if (cR[i].ToString() == "1")
                    {
                        count++;
                    }
                }
                int[] node = new int[2];
                node[0] = R - count;
                node[1] = R + count;
                foreach (int cnode in node)
                {
                    if (1 <= cnode && cnode <= N && !visit.Contains(cnode))
                    {
                        al.Add(cnode);
                        queue.Add(cnode);
                        visit.Add(cnode);
                        exist = true;
                    }


                }
                if (exist == false)
                {
                    queue.Remove(R);
                }
                al.Remove(R);
                if (al.Count != 0)
                {
                    R = al[0];
                }
            }
            if (R == N)
            {
                queue.Add(R);
                Console.WriteLine(queue.Count);
            }
            else
            {
                Console.WriteLine(-1);
            }
        }
    }
}