Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_51 (grid VARCHAR, laps VARCHAR, driver VARCHAR)
### Question:
When driver heinz-harald frentzen has a number of laps greater than 60, what is the sum of grid?
### Answer:
SELECT COUNT(grid) FROM table_name_51 WHERE laps > 60 AND driver = "heinz-harald frentzen"