input: from typing import List
  
  
  def countEvenNum(lst: List[int]) -> int:
      """
      Counts the number of even numbers in a given list of integers.
      >>> countEvenNum([1, 2, 3, 4, 5])
      2
      >>> countEvenNum([11, 13, 15])
      0
      >>> countEvenNum([10, 12, 14, 16])
      4
      """
      return len([x for x in lst if x % 2 == 0])
output:     return len([x for x in lst if x % 2 == 0])