Guests are arriving at a party at a rate of 20 per hour. Each guest will be checked in, served a drink, and accompanied to his/her table by one receptionist, one bartender, and one usher respectively. The receptionist can serve 1 guests per minute, and the usher can serve 16 guests per hour. The bartender takes 9 minutes to serve one guest.

Which is the process capacity per hour?

Round your answer to the nearest integer.