gole = gets.to_i
current = 1
root_count = 1

until current >= gole do
  move = current.to_s(2).count("1")
  root_count += 1
  if root_count > gole then
    root_count = -1
    break
  elsif current + move == gole then
    break
  elsif current + move > gole then
    current -= move
  elsif current + move < gole then
    current += move
  end
end
puts root_count