How many weights are there when the flange with is 304?
CREATE TABLE table_2286 (
    "Type" text,
    "Beam height (mm)" real,
    "Flange width (mm)" real,
    "Web thickness (mm)" text,
    "Flange thickness (mm)" text,
    "Weight (kg/m)" text,
    "Cross-section area (cm 2 )" text,
    "Moment of inertia in torsion (J) (cm 4 )" text
)
SELECT COUNT("Weight (kg/m)") FROM table_2286 WHERE "Flange width (mm)" = '304'
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 weights are there when the flange with is 304? ### Input: CREATE TABLE table_2286 (
    "Type" text,
    "Beam height (mm)" real,
    "Flange width (mm)" real,
    "Web thickness (mm)" text,
    "Flange thickness (mm)" text,
    "Weight (kg/m)" text,
    "Cross-section area (cm 2 )" text,
    "Moment of inertia in torsion (J) (cm 4 )" text
) ### Response: SELECT COUNT("Weight (kg/m)") FROM table_2286 WHERE "Flange width (mm)" = '304'