using System;
using System.Collections.Generic;
using System.Text;
using sc = Scanner;
using System.Collections;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        Solve();

#if DEBUG
        Console.WriteLine("終了するにはなにかキーを押して下さい...");
        Console.ReadKey();
#endif

    }

    static void Solve()
    {
        int n = sc.NextInt();
        bool[]alreadyReached = new bool[n+1];
        Queue<int[]> sim = new Queue<int[]>();
        sim.Enqueue(new int[]{1,0});
        alreadyReached[1] = true;
        while (sim.Count != 0)
        {
            int[] tmp = sim.Dequeue();
#if DEBUG
            Console.Write(tmp[0]);
            Console.Write("  "+tmp[1]);
            Console.WriteLine();
#endif 
            int moveCount = 0;
            for (int i = 1; i < 10000; i =i*2)
            {
                if ((tmp[0] & i) != 0)
                {
                    moveCount++;
                }
            }
#if DEBUG
            Console.WriteLine(moveCount);
#endif 
            if (tmp[0]+ moveCount == n)
            {
                Console.WriteLine(tmp[1]+1+1);
                return;
            }
            if (tmp[0] - moveCount > 1 && !alreadyReached[tmp[0] - moveCount])
            {
                alreadyReached[tmp[0] - moveCount] = true;
                sim.Enqueue(new int[]{tmp[0] - moveCount,tmp[1]+1} );
            }
            if (tmp[0]+ moveCount < n+1 && !alreadyReached[tmp[0] + moveCount])
            {
                alreadyReached[tmp[0] + moveCount] = true;
                sim.Enqueue(new int[]{tmp[0]+ moveCount,tmp[1]+1});
            }
        }
        Console.WriteLine(-1);
#if DEBUG
        Console.WriteLine("local check"); // Visual Studioのローカル変数チェック用 MainにいくとSolve内のローカル変数消えちゃう
#endif 
    }

 }

public static class Scanner
{
    public static string[] NextStrArray()
    {
        return Console.ReadLine().Split(' ');
    }

    public static long[] NextLongArray()
    {
        string[] s = NextStrArray();
        long[] a = new long[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = long.Parse(s[i]);
        }
        return a;
    }
    public static int[] NextIntArray()
    {

        string[] s = NextStrArray();
        int[] a = new int[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = int.Parse(s[i]);
        }
        return a;
    }
    public static int NextInt()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return int.Parse(tmp);
    }
    public static double NextDouble()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return double.Parse(tmp);
    }
    public static long NextLong()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return long.Parse(tmp);
    }
    public static double[] NextDoubleArray()
    {

        string[] s = NextStrArray();
        double[] a = new double[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = double.Parse(s[i]);
        }
        return a;
    }
}