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_17413485_1 ( episode VARCHAR, graemes_guest VARCHAR )

### Question ###
what is the number of the episode where maria mcerlane where gramer guest

### Accurate SQL ###

SELECT episode FROM table_17413485_1 WHERE graemes_guest = "Maria McErlane"