how many of his operettas were 3 acts ?
CREATE TABLE table_203_501 (
    id number,
    "title" text,
    "genre" text,
    "sub\u00addivisions" text,
    "libretto" text,
    "premiere date" text,
    "place, theatre" text
)
SELECT COUNT("title") FROM table_203_501 WHERE "sub\u00addivisions" = '3 acts'
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 of his operettas were 3 acts ? ### Input: CREATE TABLE table_203_501 (
    id number,
    "title" text,
    "genre" text,
    "sub\u00addivisions" text,
    "libretto" text,
    "premiere date" text,
    "place, theatre" text
) ### Response: SELECT COUNT("title") FROM table_203_501 WHERE "sub\u00addivisions" = '3 acts'