CREATE TABLE table_30016 ("Province" TEXT, "Provincial capital" TEXT, "Commandery" TEXT, "Commandery capital" TEXT, "No. of counties" FLOAT)

When yidu is the commandery what is the lowest number of countries?
SELECT MIN("No. of counties") FROM table_30016 WHERE "Commandery" = 'Yidu 宜都'
SELECT MIN("No. of counties") FROM "table_30016" WHERE "Commandery" = 'Yidu 宜都'