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

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int c = 1;
            int pos = 1;
            int[] flag = new int[N];
            foreach(int i in flag)
            {
                flag[i] = 0;
            }
            flag[0] = 1;
            while(pos != N)
            {
                //進む場合Ｎ以下になるかどうか
                if ((pos + bits(pos)) <= N)
                {
                    flag[pos] = 1;
                    pos += bits(pos);
                    c++;
                }
                else //戻る処理
                {
                    //戻るところが前の所の場合
                    if (flag[pos - bits(pos)] == 1)
                    {
                        Console.WriteLine("{0}", "-1");
                        break;
                    }

                    flag[pos] = 1;
                    pos -= bits(pos);
                    c++;
                }
            }

            if (pos == N) Console.WriteLine("{0}", c);
            Console.ReadLine();
        }

        //10進数を2進数にした時の1ビットの数を返す関数
        static int bits(int num)
        {
            string bits = "";
            for(int i = num;0 < i;i /= 2)
            {
                if (i % 2 == 1) bits += (i % 2);
            }
            return num = bits.Length;
        }



    }
}