CREATE TABLE table_name_18 (production_number INT, title VARCHAR, director VARCHAR, series VARCHAR)

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