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

namespace YukiCoder
{
    class Program
    {
        static int[] bitCnt = new int[] { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
        static int[] pnStep;
        static int nMax;

        static int pnBitN(int ni)
        {
            return bitCnt[ni % 16]
                 + bitCnt[ni / 16 % 16]
                 + bitCnt[ni / 16 / 16 % 16]
                 + bitCnt[ni / 16 / 16 / 16 % 16];
        }

        static int zzz(int ns, int ni)
        {
            if (ni < 1 || ni > nMax) return nMax;
            if (ni == nMax) return 1;

            if (ns >= pnStep[ni]) return nMax;
            pnStep[ni] = ns;

            int n = pnBitN(ni);
            int na = zzz(ns + 1, ni + n);
            int nb = zzz(ns + 1, ni - n);
            return (na < nb ? na : nb) + 1;
        }

        static void Main(string[] args)
        {
            nMax = int.Parse(Console.ReadLine());
            pnStep = (new Int32[nMax+1]).Select(s => nMax).ToArray();
            int n = zzz(1, 1);
            if (n >= nMax && n != 1) n = -1;
            Console.WriteLine(n);
            Console.ReadLine();
        }
    }
}