Suppose that a pizza parlor features four specialty pizzas and pizzas with three or fewer unique toppings (no choosing anchovies twice!) chosen from 17 available toppings. How many different pizzas are there?
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Pizzas with no topping: 4 Pizzas withne one topping: 4*17 Pizzas with two toppings: 4*17*16 Pizzas with three toppings: 4*17*16*15