8 * 17 * 6 = 816 different possible combinations.
make the problem simpler and you can see how it works.
consider 2 different flavored yogurts with 2 different toppings and 2 different sauces.
the total number of possible combinations would be 2 * 2 * 2 = 8.
consider the yogurts are vanilla and chocolate.
consider the toppings are walnuts and cherries.
consider the sauces are chocolate and strawberry.
your 8 different possible combinations are:
yogurt topping sauce
vanilla walnuts chocolate
strawberry
cherries chocolate
strawberry
chocolate walnuts chocolate
strawberry
cherries chocolate
strawberry