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_28181401_4 (attendance INTEGER, round VARCHAR)
### Question:
When semi final (2nd leg) is the round what is the highest attendance?
### Answer:
SELECT MAX(attendance) FROM table_28181401_4 WHERE round = "Semi Final (2nd leg)"