input: from typing import List
  
  
  def countEvenNum(numbers: List[int]) -> int:
      """ Count the number of even numbers in a given list of numbers.
      >>> countEvenNum([1, 2, 3, 4, 5])
      2
      >>> countEvenNum([2, 4, 6, 8, 10])
      5
      """
output:     count = 0
      for num in numbers:
          if num % 2 == 0:
              count += 1
      return count