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_53 (sno INTEGER, completion_schedule VARCHAR)
### Question:
For the 2013 completion schedule, what is the total S.no.?
### Answer:
SELECT SUM(sno) FROM table_name_53 WHERE completion_schedule = "2013"