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_87 (grid INTEGER, laps VARCHAR, time_retired VARCHAR)
### Question:
What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was injection?
### Answer:
SELECT SUM(grid) FROM table_name_87 WHERE laps < 68 AND time_retired = "injection"