input: Write a function to take any number of integer arguments and return their sum.
  
  assert sum_ints(3, 5, 7) == 15
  assert sum_ints(1, 2, 3, 4, 5) == 15
  assert sum_ints() == 0
  assert sum_ints(-1, -2, -3) == -6
  assert sum_ints(0) == 0
output: def sum_ints(*args):
      return sum(args)