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_15430606_1 (no_disc INTEGER, directed_by VARCHAR)
### Question:
Name the maximum number of disc for bill gereghty
### Answer:
SELECT MAX(no_disc) FROM table_15430606_1 WHERE directed_by = "Bill Gereghty"