input: def calculate_average_of_five_numbers(nums: List[float]) -> float:
      """ Calculate the average of five numbers entered by a user.
      >>> calculate_average_of_five_numbers([10.0, 20.0, 30.0, 40.0, 50.0])
      30.0
      >>> calculate_average_of_five_numbers([5.0, 15.0, 25.0, 35.0, 45.0])
      25.0
      """
      return sum(nums) / len(nums)
output:     return sum(nums) / len(nums)