CREATE TABLE table_7369 ("Position" TEXT, "Jersey #" FLOAT, "Name" TEXT, "Height  ( cm ) " FLOAT, "Weight  ( kg ) " FLOAT, "Birthdate" TEXT, "Birthplace" TEXT, "1983\\u20131984 Team" TEXT)

What is the greatest height (cm) that has a 1983-1984 team of montreal canadiens, with a jersey less than 21?
SELECT MAX("Height (cm)") FROM table_7369 WHERE "1983\u20131984 Team" = 'montreal canadiens' AND "Jersey #" < '21'
SELECT MAX("Height (cm)") FROM "table_7369" WHERE "1983\u20131984 Team" = 'montreal canadiens' AND "Jersey #" < '21'