How many Horsepowers have a Year smaller than 1974, and a Tonnage of 4437?
CREATE TABLE table_37546 (
    "Name" text,
    "Length" text,
    "Tonnage" real,
    "Built by" text,
    "Year" real,
    "Engines" text,
    "Horsepowers" real,
    "Former Names" text
)
SELECT SUM("Horsepowers") FROM table_37546 WHERE "Year" < '1974' AND "Tonnage" = '4437'
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 Horsepowers have a Year smaller than 1974, and a Tonnage of 4437? ### Input: CREATE TABLE table_37546 (
    "Name" text,
    "Length" text,
    "Tonnage" real,
    "Built by" text,
    "Year" real,
    "Engines" text,
    "Horsepowers" real,
    "Former Names" text
) ### Response: SELECT SUM("Horsepowers") FROM table_37546 WHERE "Year" < '1974' AND "Tonnage" = '4437'