input: 
  def calculate_average(numbers: List[int]) -> float:
      """Calculate the average of a list of five numbers.
      >>> calculate_average([10, 20, 30, 40, 50])
      30.0
      >>> calculate_average([5, 15, 25, 35, 45])
      25.0
      """
      return sum(numbers) / len(numbers)
  
output:     return sum(numbers) / len(numbers)