class Adder

  def self.add_two(arg)
    arg + 2
  end

  def self.add_three(arg)
    arg + 3
  end

  def self.add_four(arg)
    arg + 4
  end

end


puts Adder.add_two(10)
puts Adder.add_three(10)
puts Adder.add_four(10)
