user: Question: How many rounds did Geoff Lees drive with chassis of N180?
Columns: ['Constructor', 'Chassis', 'Engine', 'Tyres', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ferrari', '312T5', 'Ferrari 015 3.0 F12', 'M', 'Jody Scheckter', 'All']
SQL:

assistant: SELECT SUM("Rounds") FROM "Table" WHERE "Chassis" = 'N180' AND "Driver" = 'Geoff Lees';