input: Write a function that takes any number of integer arguments and returns their sum. If no arguments are provided, return 0.
  assert sum_ints(3, 5, 7) == 15
  assert sum_ints() == 0
  assert sum_ints(10, 20, 30, 40, 50) == 150
  assert sum_ints(-1, -2, -3, 4, 5) == 3
  assert sum_ints(0, 0, 0) == 0
output: def sum_ints(*args):
      return sum(args)