CREATE TABLE table_24515 ("Regional" TEXT, "Champions" TEXT, "Runners-up" TEXT, "Third place" TEXT, "Fourth place" TEXT)

how many persons got the fourth position when the regional was shikoku?
SELECT COUNT("Fourth place") FROM table_24515 WHERE "Regional" = 'Shikoku'
SELECT COUNT("Fourth place") FROM "table_24515" WHERE "Regional" = 'Shikoku'