input: 
  from typing import List
  
  def calculate_average(numbers: List[int]) -> float:
      """ Calculate the average of given five numbers.
      >>> calculate_average([10, 20, 30, 40, 50])
      30.0
      >>> calculate_average([5, 10, 15, 20, 25])
      15.0
      """
      return sum(numbers) / len(numbers)
  
output:     return sum(numbers) / len(numbers)