input: from typing import List
  
  
  def sum_ints(*args):
      total = 0
      for num in args:
          total += num
      
      return total
  
  """
  Examples:
  >>> sum_ints(3, 5, 7)
  15
  >>> sum_ints(1, 2, 3, 4, 5)
  15
  """
output:     
      for num in args:
          if isinstance(num, int):
              total += num
          else:
              return None
      return total
  