user: Question: How many Podiums have a Class of 250cc, and an F laps of 0?
Columns: ['Year', 'Class', 'Team', 'Bike', 'Races', 'Wins', 'Podiums', 'Poles', 'F. laps', 'Points']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['2002', '125cc', 'Matteoni Racing Team', 'Aprilia RS 125', 6.0, 0.0, 0.0, 0.0, 0.0, 3.0]
SQL:

assistant: SELECT SUM("Podiums") FROM "Table" WHERE "Class" = '250cc' AND "F. laps" = 0.0;