Beijing Restaurant
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SOUPS :Tofu soupY=10. 00   Bone soupY=15. 00   Chicken soupY=20. 00
STAPLES:Fried riceY=8. 00   Fried noodlesY=10. 00   Hot dogY=4. 00
Meat pieY=10. 00   SandwichY=10. 00   HamburgerY=10. 00
MAIN COURSES:Roast chickenY=30. 00   Italian pizzaY=9. 00   Indian curriesY=15. 00
Pork and cabbageY=15. 00   Cheese pieY=10. 00   BeefY=15. 00
Beijing Roast DuckY=50. 00   SausageY=15. 00
DESSERTS :Fruit saladY=8. 00   Pear pancakeY=6. 00   Apple pieY=6. 00   Ice creamY=4. 00 DRINKS :CokeY=5. 00   CoffeeY=5. 00   TeaY=3. 00   Apple juiceY=3. 00
BeerY=10. 00   WineY=30. 00   MilkY=3. 00   LemonadeY=4. 00
How many kinds of main courses are there in this restaurant?
7. 8. 9. 10.