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_name_18 ( podiums INTEGER, class VARCHAR, f_laps VARCHAR )

### Question ###
How many Podiums have a Class of 250cc, and an F laps of 0?

### Accurate SQL ###

SELECT SUM(podiums) FROM table_name_18 WHERE class = "250cc" AND f_laps = 0