text: """"Function that returns constant 4 for any parameter"""
  
  
  def f_c(x):
      """"
      Function that returns constant 4 for any parameter
      """
      return 4
  
  
  def f_x(x, a, b):
      return a * x + b
  
  
  def sum(x):
      num1 = f_x(x, 1, 1)
      num2 = f_x(x, 2, 2)
      num3 = f_x(x, 3, 3)
      return num1 + num2 + num3
  
  