user: ### NOW ANSWER:
Question: What is the number of the grid for johnny herbert with more than 52 laps?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Mika Häkkinen', 'McLaren - Mercedes', 53.0, '1:31:18.785', 2.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Driver" = 'johnny herbert' AND "Laps" > 52.0;