What's the week when the result was W 38-24 and attendance was less than 43,449?
CREATE TABLE table_13723 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Attendance" real
)
SELECT SUM("Week") FROM table_13723 WHERE "Result" = 'w 38-24' AND "Attendance" < '43,449'
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: What's the week when the result was W 38-24 and attendance was less than 43,449? ### Input: CREATE TABLE table_13723 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Attendance" real
) ### Response: SELECT SUM("Week") FROM table_13723 WHERE "Result" = 'w 38-24' AND "Attendance" < '43,449'