How many stages are there?
CREATE TABLE table_27971 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Sprint Classification" text,
    "Mountains Classification" text,
    "Points Classification" text,
    "Team Classification" text
)
SELECT MAX("Stage") FROM table_27971
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 stages are there? ### Input: CREATE TABLE table_27971 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Sprint Classification" text,
    "Mountains Classification" text,
    "Points Classification" text,
    "Team Classification" text
) ### Response: SELECT MAX("Stage") FROM table_27971