CREATE TABLE table_53263 ("NATO member" TEXT, "Aircraft carriers" TEXT, "Battleships" TEXT, "Cruisers" TEXT, "Escorts" TEXT, "Submarines" TEXT, "Torpedo boat squadrons" TEXT, "s Motor ship / s Naval trawler" TEXT, "Grand Total" FLOAT)

How many ships for the nation with grand total of 20?
SELECT "s Motor ship / s Naval trawler" FROM table_53263 WHERE "Grand Total" = '20'
SELECT "s Motor ship / s Naval trawler" FROM "table_53263" WHERE "Grand Total" = '20'