class Calc0126
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @a, @b, @s = args.shift.map(&:to_i)
  end

  def run
    if @s == 1
      (@a - 1).abs + 1
    elsif (@a - @s).abs > (@b - @s).abs
      if (@a - @s).abs > (@s - 1) || @a == 0
        (@b - @s).abs + (@s - 1) + (@a - 1).abs + 1
      else
        (@b - @s).abs + (@a - @s).abs + (@a - 1) + 1
      end
    else
      (@a - @s).abs + @s
    end
  end
end

puts Calc0126.new(STDIN.readlines).run if __FILE__ == $0