inputs = STDIN.readlines.map(&:chomp)
N = inputs[0].to_i

class Koma
  def initialize(pos)
    @pos = pos
  end

  attr_reader :pos

  def ==(other)
    @pos == other.pos
  end

  def valid?
    1 <= @pos && @pos <= N
  end

  def goal?
    @pos == N
  end

  def next_cands
    ons = @pos.to_s(2).count('1')
    [Koma.new(@pos + ons), Koma.new(@pos - ons)].select(&:valid?)
  end
end

def search
  queue = [[Koma.new(1)]]
  visited = { 1 => true }
  until queue.empty?
    path = queue.shift
    cands = path.last.next_cands.reject { |cand| visited[cand.pos] }
    return path.size + 1 if cands.any?(&:goal?)
    queue.push(*cands.map { |cand| path + [cand] })
    visited.update(cands.map { |cand| [cand.pos, true] }.to_h)
  end
  -1
end

puts N == 1 ? 1 : search