input: 
  def calculate_average_of_five_numbers(num1: float, num2: float, num3: float, num4: float, num5: float) -> float:
      """ Calculate the average of five numbers entered by a user.
      >>> calculate_average_of_five_numbers(2.0, 4.0, 6.0, 8.0, 10.0)
      6.0
      >>> calculate_average_of_five_numbers(1.5, 2.5, 3.5, 4.5, 5.5)
      3.5
      """
  
output:     return (num1 + num2 + num3 + num4 + num5) / 5