How many players had 6 180s?
CREATE TABLE table_23721 (
    "Player" text,
    "Played" real,
    "Legs Won" real,
    "Legs Lost" real,
    "100+" real,
    "140+" real,
    "180s" real,
    "High Checkout" real,
    "3-dart Average" text
)
SELECT COUNT("Player") FROM table_23721 WHERE "180s" = '6'
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 players had 6 180s? ### Input: CREATE TABLE table_23721 (
    "Player" text,
    "Played" real,
    "Legs Won" real,
    "Legs Lost" real,
    "100+" real,
    "140+" real,
    "180s" real,
    "High Checkout" real,
    "3-dart Average" text
) ### Response: SELECT COUNT("Player") FROM table_23721 WHERE "180s" = '6'