What's the post code of the county with the Chinese name  潜山县 / 潛山縣?
CREATE TABLE "administration" (
  "english_name" text,
  "chinese_name_simplified_traditional" text,
  "pinyin" text,
  "population" real,
  "post_code" real
);
SELECT MIN("post_code") FROM "administration" WHERE "chinese_name_simplified_traditional"='潜山县 / 潛山縣';