How many classes are taken in the third year when pag-unawa was taken in the first year?
CREATE TABLE table_17492 (
    "Subjects" text,
    "First Year" text,
    "Second Year" text,
    "Third Year" text,
    "Fourth Year" text
)
SELECT COUNT("Third Year") FROM table_17492 WHERE "First Year" = 'Pag-unawa'
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 classes are taken in the third year when pag-unawa was taken in the first year? ### Input: CREATE TABLE table_17492 (
    "Subjects" text,
    "First Year" text,
    "Second Year" text,
    "Third Year" text,
    "Fourth Year" text
) ### Response: SELECT COUNT("Third Year") FROM table_17492 WHERE "First Year" = 'Pag-unawa'