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 (production_number INTEGER, title VARCHAR, director VARCHAR, series VARCHAR)
### Question:
What is the production number directed by Robert McKimson in series mm titled People Are Bunny?
### Answer:
SELECT SUM(production_number) FROM table_name_18 WHERE director = "robert mckimson" AND series = "mm" AND title = "people are bunny"