How many years has an engine of audi 3.6l turbo v8 and 1st as the rank with an audi r8r as the chassis?
CREATE TABLE table_70423 (
    "Year" real,
    "Entrant" text,
    "Class" text,
    "Chassis" text,
    "Engine" text,
    "Rank" text,
    "Points" text
)
SELECT COUNT("Year") FROM table_70423 WHERE "Engine" = 'audi 3.6l turbo v8' AND "Rank" = '1st' AND "Chassis" = 'audi r8r'
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 years has an engine of audi 3.6l turbo v8 and 1st as the rank with an audi r8r as the chassis? ### Input: CREATE TABLE table_70423 (
    "Year" real,
    "Entrant" text,
    "Class" text,
    "Chassis" text,
    "Engine" text,
    "Rank" text,
    "Points" text
) ### Response: SELECT COUNT("Year") FROM table_70423 WHERE "Engine" = 'audi 3.6l turbo v8' AND "Rank" = '1st' AND "Chassis" = 'audi r8r'