CREATE TABLE table_51812 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

What's the total number of rounds with a win result at the sf 5: stadium event?
SELECT COUNT("Round") FROM table_51812 WHERE "Res." = 'win' AND "Event" = 'sf 5: stadium'
SELECT COUNT("Round") FROM "table_51812" WHERE "Event" = 'sf 5: stadium' AND "Res." = 'win'