what is the highest amount of silver when gold is 0 for soviet union?
CREATE TABLE table_name_50 (
    silver INTEGER,
    gold VARCHAR,
    nation VARCHAR
)
SELECT MAX(silver) FROM table_name_50 WHERE gold = 0 AND nation = "soviet union"
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 highest amount of silver when gold is 0 for soviet union? ### Input: CREATE TABLE table_name_50 (
    silver INTEGER,
    gold VARCHAR,
    nation VARCHAR
) ### Response: SELECT MAX(silver) FROM table_name_50 WHERE gold = 0 AND nation = "soviet union"