user: ### NOW ANSWER:
Question: How many laps were completed in grid 18?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Denny Hulme', 'McLaren - Ford', 53.0, '1:41:02.01', 10.0]
SQL:

assistant: SELECT SUM("Laps") FROM "Table" WHERE "Grid" = 18.0;