Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27334 ( "Episode No." text, "Prod No." real, "Title" text, "Directed by" text, "Written by" text, "Original UK airdate" text )

### Question ###
When don inglis and ralph smart are the writers how many episode numbers are there?

### Accurate SQL ###

SELECT COUNT("Episode No.") FROM table_27334 WHERE "Written by" = 'Don Inglis and Ralph Smart'