CREATE TABLE table_17543 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

what's the total number of title for production code 39
SELECT COUNT("Title") FROM table_17543 WHERE "Production code" = '39'
SELECT COUNT("Title") FROM "table_17543" WHERE "Production code" = '39'