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_52 (rank INTEGER, heat VARCHAR, nationality VARCHAR, lane VARCHAR)
### Question:
What rank is from Japan, has a lane smaller than 7 and a heat smaller than 3?
### Answer:
SELECT SUM(rank) FROM table_name_52 WHERE nationality = "japan" AND lane < 7 AND heat < 3