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

namespace No003_ビットすごろく
{
    class Program
    {
        static private List<int> Number = new List<int>();
        static private int N;

        static void Main(string[] args)
        {
            N = int.Parse(Console.ReadLine());
            bool[] progression = new bool[N + 1];

            Search(1, 1, progression);

            if (Number.Count == 0)
                Console.WriteLine(-1);
            else
                Console.WriteLine(Number.Min());
        }

        static void Search(int level, int count, bool[] progression)
        {
            if (level == N)
            {
                Number.Add(count);
                return;
            }
            else if (level < 1 || level > N || progression[level])
            {
                return;
            }
            else
            {
                progression[level] = true;
                Search(level + BitNumber(level), count + 1, progression);
                Search(level - BitNumber(level), count + 1, progression);
            }
        }

        static int BitNumber(int a)
        {
            int temp = 0;

            do
            {
                temp += a % 2;
                a /= 2;
            } while (a > 0);

            return temp;
        }
    }
}