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_23492454_1 (no_in_series VARCHAR, no_in_season VARCHAR)
### Question:
How many episodes in the series are also episode 18 in the season?
### Answer:
SELECT COUNT(no_in_series) FROM table_23492454_1 WHERE no_in_season = 18