CREATE TABLE table_28230 ("Stage" FLOAT, "Winner" TEXT, "General classification" TEXT, "Points classification" TEXT, "Mountains classification" TEXT, "Young rider classification" TEXT, "Team classification" TEXT, "Combativity award" TEXT)

How many mountains classifications when Rui Costa is the winner?
SELECT COUNT("Mountains classification") FROM table_28230 WHERE "Winner" = 'Rui Costa'
SELECT COUNT("Mountains classification") FROM "table_28230" WHERE "Winner" = 'Rui Costa'