class Pizza:
    order_number = 1
    def __init__(self, ingredients=[]):
        self.ingredients = ingredients
        self.ordr = 0


    def hawaiian(self):
        ingredients = ['ham', 'pineapple']
        self.ordr = Pizza.order_number + 1
        return Pizza(ingredients)

    def meat_festival(self):
        ingredients = ['beef', 'meatball', 'bacon']
        self.ordr = Pizza.order_number + 1
        return Pizza(ingredients)

p1 = Pizza(['ham', 'apple', 'jam'])
p2 = Pizza.hawaiian()
p3 = Pizza.meat_festival()

print(p1.ingredients)
print(p2.ingredients)
print(p1.order_number)
print(p3.order_number)