How many mountains classifications when Rui Costa is the winner?
CREATE TABLE table_28230 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Young rider classification" text,
    "Team classification" text,
    "Combativity award" text
)
SELECT COUNT("Mountains classification") FROM table_28230 WHERE "Winner" = 'Rui Costa'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many mountains classifications when Rui Costa is the winner? ### Input: CREATE TABLE table_28230 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Young rider classification" text,
    "Team classification" text,
    "Combativity award" text
) ### Response: SELECT COUNT("Mountains classification") FROM table_28230 WHERE "Winner" = 'Rui Costa'