using System;

namespace BitSugoroku
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int R = MainProcess(N);
            Console.WriteLine(R);
        }

        private static int MainProcess(int N)
        {
            int[] Squares = new int[N + 1];
            Squares[1] = 1;
            int bits = 0;
            bool newdiscovery = true;
            while(Squares[N] == 0 && newdiscovery)
            {
                newdiscovery = false;
                for (int x = 1; x < N ; x++)
                {
                    if (Squares[x] > 0)
                    {
                        bits = BitCounter(x);
                        if (x + bits <= N && (Squares[x + bits] == 0 || Squares[x + bits] > Squares[x] + 1))
                        {
                            Squares[x + bits] = Squares[x] + 1;
                            newdiscovery = true;
                        }
                        if (x - bits >= 0 && (Squares[x - bits] == 0 || Squares[x - bits] > Squares[x] + 1))
                        {
                            Squares[x - bits] = Squares[x] + 1;
                            newdiscovery = true;
                        }
                    }
                }

            }
            return (Squares[N] == 0) ? -1 : Squares[N];
        }

        private static int BitCounter(int x)
        {
            int b = 0;
            while (x > 0)
            {
                b += x % 2;
                x /= 2;
            }
            return b;
        }
    }
}