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_22 (serial_no INTEGER, headquartered_city VARCHAR)
### Question:
What is the sum of the serial numbers for narowal city?
### Answer:
SELECT SUM(serial_no) FROM table_name_22 WHERE headquartered_city = "narowal city"