class Calc0003
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @n = args.shift.first.to_i
    @visited = Array.new(@n) { false }
  end

  def run
    queue = [[1, 1]]
    until queue.empty?
      k, c = queue.shift
      return c if k == @n
      queue.push(*cands(k).map { |m| [m, c + 1] })
    end
    -1
  end

  def cands(k)
    d = k.to_s(2).count('1')
    r = [k - d, k + d].select { |m|
      1 <= m && m <= @n && !@visited[m]
    }
    r.each do |m|
      @visited[m] = true
    end
    r
  end
end

puts Calc0003.new(STDIN.readlines).run if __FILE__ == $0