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_25 (grid INTEGER, rider VARCHAR)
### Question:
What is the grid for dirk heidolf?
### Answer:
SELECT SUM(grid) FROM table_name_25 WHERE rider = "dirk heidolf"