user: Question: How many laps did Nick Heidfeld drive on grids larger than 4?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Mika Häkkinen', 'McLaren - Mercedes', 77.0, '1:45:33.869', 3.0]
SQL:

assistant: SELECT SUM("Laps") FROM "Table" WHERE "Grid" > 4.0 AND "Driver" = 'Nick Heidfeld';