def p_bit(position)
  position.to_s(2).split('').map(&:to_i).inject(:+)
end
n = gets.to_i
reached = [1]
deep = 0
rd = [[1]]
loop do
  array = []
  rd[deep].each do |position|
    b = p_bit(position)
    [position + b, position - b].each do |a|
      next if a < 0 || a > n
      unless reached.include?(a)
        array << a
        reached << a
      end
    end
  end
  deep += 1
  if array.include?(n)
    puts deep + 1
    break
  end
  if array.empty?
    puts -1
    break
  end
  rd << array
end