How many were in the battle between the Monitor and the Merrimack?

If the question asks only about the crews of the two ships, the Monitor had a crew of 59, and the Merrimack had 320, but the entire two-day Battle of Hampton Roads involved thousands more. The Merrimack was joined by five CSN gunboats, and there were five USN warships at Hampton Roads. [The Merrimack sank two of them before the Monitor arrived.]