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_26010857_13 (stage INTEGER, teams_classification VARCHAR)
### Question:
How many stages did Team Sky lead the teams classification?
### Answer:
SELECT MAX(stage) FROM table_26010857_13 WHERE teams_classification = "Team Sky"