Table schema:
CREATE TABLE table_name_66 (total_cargo__metric_tonnes_ INTEGER, rank VARCHAR, airport VARCHAR)

Question: Which Total Cargo (Metric Tonnes) is the highest one that has a Rank smaller than 4, and an Airport of shanghai pudong international airport?
SQL: SELECT MAX(total_cargo__metric_tonnes_) FROM table_name_66 WHERE rank < 4 AND airport = "shanghai pudong international airport"