What is the sum of all silver medals with less than 23 medals in total and more than 3 bronze medals for the United States?
CREATE TABLE table_name_21 (
    silver INTEGER,
    bronze VARCHAR,
    total VARCHAR,
    nation VARCHAR
)
SELECT SUM(silver) FROM table_name_21 WHERE total < 23 AND nation = "united states" AND bronze > 3
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 is the sum of all silver medals with less than 23 medals in total and more than 3 bronze medals for the United States? ### Input: CREATE TABLE table_name_21 (
    silver INTEGER,
    bronze VARCHAR,
    total VARCHAR,
    nation VARCHAR
) ### Response: SELECT SUM(silver) FROM table_name_21 WHERE total < 23 AND nation = "united states" AND bronze > 3