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

class P
{
    static void DepthFirstSearch(int goal)
    {
        int x = path[path.Count - 1];
        int step = Convert.ToString(x, 2).Replace("0", "").Length;
        if (x == goal)
        {
            result.Add(path.Count);
        }
        else
        {
            int post = x + step;
            if (!path.Contains(post) && 1 <= post && post <= goal)
            {
                path.Add(post);
                DepthFirstSearch(goal);
            }

            int pre = x - step;
            if (!path.Contains(pre) && 1 <= pre && pre <= goal)
            {
                path.Add(pre);
                DepthFirstSearch(goal);
            }
        }
    }

    static List<int> path = new List<int>() { 1 };
    static List<int> result = new List<int>();

    static void Main()
    {
        DepthFirstSearch(int.Parse(Console.ReadLine()));
        Console.WriteLine(result.Count == 0 ? -1 : result.Min());
    }
}