In a group of 50 patrons, 8 patrons like lattes and espressos, 12 patrons like espressos and cappuccino, 9 patrons like lattes a
nd cappuccinos and 5 patrons like all 3 coffeee drinks, all together 20 patrons like lattes, 28 patrons like espressos, and 19 patrons like cappuccinos. How many patrons don't like any of these coffee drinks?
