input: def count_even_numbers(numbers: List[int]) -> int:
      """ Return the number of even numbers present in the given list of numbers.
      
      >>> count_even_numbers([1, 2, 3, 4, 5])
      2
      >>> count_even_numbers([11, 12, 13, 14, 15])
      1
      >>> count_even_numbers([0, 2, 4, 6, 8, 10])
      6
      >>> count_even_numbers([9, 15, 27, 31])
      0
      """
output:     count = 0
      for num in numbers:
          if num % 2 == 0:
              count += 1
      return count