CREATE TABLE table_617 ("English Name" TEXT, "Simplified" TEXT, "Traditional" TEXT, "Pinyin" TEXT, "Area" FLOAT, "Population" FLOAT, "Density" FLOAT)

What is the density of yushan county?
SELECT COUNT("Density") FROM table_617 WHERE "English Name" = 'Yushan County'
SELECT COUNT("Density") FROM "table_617" WHERE "English Name" = 'Yushan County'