CREATE TABLE table_23042 ("No." FLOAT, "Country" TEXT, "Local title" TEXT, "Format" TEXT, "Start Date" TEXT, "End Date" TEXT, "Episodes" FLOAT, "Premiere/Air Dates" TEXT)

What series number had the local title of Fort Boyard?
SELECT MAX("No.") FROM table_23042 WHERE "Local title" = 'Fort Boyard'
SELECT MAX("No.") FROM "table_23042" WHERE "Local title" = 'Fort Boyard'