Response:  1. Pepperoni pizza - 285 calories per slice
  2. Black olives - 5 calories each, 10 olives = 50 calories
  3. Green bell pepper - 20 calories per cup, 1/2 cup = 10 calories
  4. Onion - 8 calories per cup, 1/4 cup = 2 calories
  5. Mushrooms - 5 calories per cup, 1/4 cup = 1 calorie
  6. Cheese - 113 calories per slice
  
  Total calories: 461 calories