input: Write a python function to calculate the sum of the values in a dictionary.
  assert get_dict_sum({'a': 1, 'b': 2, 'c': 3}) == 6
  assert get_dict_sum({'x': 10, 'y': 5, 'z': 15}) == 30
  assert get_dict_sum({'apple': 5, 'banana': 7, 'cherry': 3}) == 15
output: def get_dict_sum(d):
      return sum(d.values())