CREATE TABLE table_204_885 (id DECIMAL, "season" TEXT, "competition" TEXT, "round" TEXT, "opponent" TEXT, "home" TEXT, "away" TEXT, "agg." TEXT, "bye" TEXT)

how many european cups has this team been a part of ?
SELECT COUNT(DISTINCT ("season")) FROM table_204_885 WHERE "competition" = 'european cup'
SELECT COUNT(DISTINCT "season") FROM "table_204_885" WHERE "competition" = 'european cup'