input: def element_exists(elem: int, list_int: List[int]) -> bool:
      """ Check if the given element exists within the provided list of integers.
      >>> element_exists(3, [1, 2, 3, 4])
      True
      >>> element_exists(5, [1, 2, 3, 4])
      False
      """
output:     return elem in list_int