Complementary Goods

Mr Tokai is very particular in how he makes his coffee. He is completely inflexible in that he can only take 1 teaspoon of coffee with 2 teaspoons of sugar. Any more coffee or sugar given to him is discarded in his quest for the perfect coffee. Suppose you give him 9 teaspoons of coffee and 2 teaspoons of sugar. How many cups of coffee can he create from this?