CREATE TABLE table_16635 ("Rd." FLOAT, "Grand Prix" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Constructor" TEXT, "Report" TEXT)

What number is the Monaco Grand Prix?
SELECT "Rd." FROM table_16635 WHERE "Grand Prix" = 'Monaco Grand Prix'
SELECT "Rd." FROM "table_16635" WHERE "Grand Prix" = 'Monaco Grand Prix'