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_32 (platform INTEGER, destination VARCHAR, frequency__per_hour_ VARCHAR, operator VARCHAR)
### Question:
what is the highest platform number when the frequency (per hour) is 4, the operator is london overground and the destination is west croydon?
### Answer:
SELECT MAX(platform) FROM table_name_32 WHERE frequency__per_hour_ = 4 AND operator = "london overground" AND destination = "west croydon"