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_13 (s_motor_ship___s_naval_trawler VARCHAR, grand_total VARCHAR)
### Question:
How many ships for the nation with grand total of 20?
### Answer:
SELECT s_motor_ship___s_naval_trawler FROM table_name_13 WHERE grand_total = 20