SCHEMA:
CREATE TABLE table_name_75 (bronze INTEGER, total VARCHAR, nation VARCHAR, silver VARCHAR, rank VARCHAR)
User Question:
What is the leowest number of Bronze medals for Jamaica who ranked less than 4 and had more than 0 silver medals and a total of less than 22 medals?


SELECT MIN(bronze) FROM table_name_75 WHERE silver > 0 AND rank < 4 AND nation = "jamaica" AND total < 22