CREATE TABLE table_74981 ("Round" FLOAT, "Pick #" FLOAT, "Overall" FLOAT, "Name" TEXT, "Position" TEXT, "College" TEXT)

In what Round with an Overall greater than 306 was the pick from the College of Virginia Tech?
SELECT COUNT("Round") FROM table_74981 WHERE "College" = 'virginia tech' AND "Overall" > '306'
SELECT COUNT("Round") FROM "table_74981" WHERE "College" = 'virginia tech' AND "Overall" > '306'