A homeowner is renovating two rooms: a living room and a dining room. The living room is 20 feet long, 15 feet wide, and 10 feet high. The dining room is 18 feet long, 12 feet wide, and 10 feet high. The homeowner needs to paint the walls of both rooms. In the living room, unpainted areas (doorways and windows) total 80 square feet. In the dining room, these areas total 60 square feet. How many total square feet of walls must be painted?