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

namespace bitscreen
{
    class Program
    {

        static int modoru(int cur, int goal, ref int step_counter, ref int modoru_counter)
        {
            int modoru_num = bitCounter(cur);
            modoru_num = cur - modoru_num;
            int ret = 0;

            if (modoru_num < 0)
            {
                modoru_counter++;
                return -2;
            }
            else if (modoru_num == goal)
            {
                step_counter++;
                return 0;
            }
            else
            {
                step_counter++;
                modoru_counter++;

                ret = susumu(modoru_num, goal, ref step_counter, ref modoru_counter);
                if(ret != 0)
                {
                    return -2;
                }
                return ret;
            }
        }

        static int susumu(int cur, int goal, ref int step_counter, ref int modoru_counter)
        {
            int susumu_num = bitCounter(cur);
            susumu_num += cur;
            if(susumu_num > goal)
            {
                return -1;
            }
            else if (susumu_num == goal)
            {
                step_counter++;
                return 0;
            }
            else
            {
                step_counter++;
                int ret;
                if (susumu_num == 0) susumu_num++;
                ret = susumu(susumu_num, goal, ref step_counter, ref modoru_counter);
                if (ret == -1)
                {
                    if(modoru_counter == 1)
                    {
                        return -1;
                    }
                    ret = modoru(susumu_num, goal, ref step_counter, ref modoru_counter);
                    if (ret == -2)
                    {
                        return -3;
                    }
                }
                return ret;
            }
        }

        static int bitCounter(int n)
        {
            int bitmask = 0x00000001;
            int data = n;
            int count = 0;
            for (int j = 0; j < 32; j++)
            {
                if ((data & bitmask) == 1) count++;
                data = data >> 1;
            }
            return count;
        }

        static void Main(string[] args)
        {
                       string s = Console.ReadLine();

           int step_counter = 0;
            int ret = 0;
            int modoru_counter = 0;

            ret = susumu(0,int.Parse(s), ref step_counter, ref modoru_counter);


            if (ret == 0)
            {
                Console.WriteLine(step_counter);
            }
            else
            {
                Console.WriteLine(-1);
            }
        }
    }
}