Table:
text: 2003 Brazilian Grand Prix
Classification
Classification
Driver Constructor_ Laps Time_Retired Grid
Michael Schumacher Ferrari 27 Accident 7
Juan Pablo Montoya Williams - BMW 25 Accident 9
Antônio Pizzonia Jaguar - Cosworth 25 Accident 17
Olivier Panis Toyota 18 Collision 15
Ralph Firman Jordan - Ford 18 Suspension 16
Justin Wilson Minardi - Cosworth 16 Spin 20
Nick Heidfeld Sauber - Petronas 8 Engine 12

Question: Consider the 2003 Brazilian Grand Prix, what is the largest grid with a driver by Ralph Firman and a lap under 18?