input: Write a function to calculate the sum of any number of integer arguments and return the total. If no arguments are provided, the function should return 0.
  assert sum_ints(3, 5, 7) == 15
  assert sum_ints(1, 2, 3, 4, 5) == 15
  assert sum_ints(-1, 1, 0) == 0
  assert sum_ints() == 0
output: def sum_ints(*args):
      return sum(args)