Mamma's Pizza advertises a special in which you can choose a thin crust, thick crust, stuffed crust, deep dish crust, or cheese crust pizza with any combination of different toppings. The ad says that there are almost 5,200 different ways that you can order the pizza. What is the smallest number of toppings available? Explain your thinking by referring to the fundamental counting principle. The smallest number of toppings available is (Type a whole number.)