Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_4 (goal_difference VARCHAR, goals_against VARCHAR, played VARCHAR)
### Question:
Tell me the totla number of goal difference for goals against of 30 and played less than 18
### Answer:
SELECT COUNT(goal_difference) FROM table_name_4 WHERE goals_against = 30 AND played < 18