class MyClass:

    def set(self, first, second, third):
        self.first = first
        self.second = second
        self.third = third

    def show(self):
        print("first" + str(self.first))
        print("second" + str(self.second))
        print("third" + str(self.third))

    def substract(self, first, second, third):
        return first - second - third

    def sum(self, first, second, third):
        return first + second + third

    def multiply(self, first, second, third):
        return first * second * third

    def divide(self, first, second):
        try:
            return first / second
        except ZeroDivisionError:
            print("деление на ноль")


a = MyClass()
a.set(1,2,3)

print("sum: " + str(a.sum(5,8,8)))
print("substract: " + str(a.substract(5,8,8)))
print("multiply: " + str(a.multiply(5,8,8)))
print("divide: " + str(a.divide(5,8)))
print("divide: " + str(a.divide(5,0)))