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_81 (erp_w VARCHAR, call_sign VARCHAR)
### Question:
What is the total number of the ERP W with a call sign of w242ak?
### Answer:
SELECT COUNT(erp_w) FROM table_name_81 WHERE call_sign = "w242ak"