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_18 (episode VARCHAR, airdate__canada_ VARCHAR)
### Question:
What is the total number of episodes aired in Canada on 22 October 2004?
### Answer:
SELECT COUNT(episode) FROM table_name_18 WHERE airdate__canada_ = "22 october 2004"