using System;
using System.Linq;

namespace No00003_BitSugoroku
{
    internal class Program
    {
        static void Main(string[] args) {
            int n = int.Parse(Console.ReadLine());
            bool[] map = new bool[n];
            int index = 1;
            int count = 0;
            while (true) {
                count++;
                if (index == n) {
                    break;
                }
                if (map[index]) {
                    count = -1;
                    break;
                }
                map[index] = true;
                int diff = Convert.ToString(index, 2).Count(x => x == '1');
                if (index + diff <= n) {
                    index += diff;
                } else {
                    index -= diff;
                }
            }
            Console.WriteLine(count);
        }
    }
}