Which Total Cargo (Metric Tonnes) is the highest one that has a Rank smaller than 4, and an Airport of shanghai pudong international airport?
CREATE TABLE "2012_preliminary_statistics" (
  "rank" real,
  "airport" text,
  "code_iata_icao" text,
  "total_cargo_metric_tonnes" real,
  "pct_change" text
);
SELECT MAX("total_cargo_metric_tonnes") FROM "2012_preliminary_statistics" WHERE "rank"<4 AND "airport"='shanghai pudong international airport';