Python FastArithmetic

class FastArithmetic(object):

    def __init__(self):
        self.x = -9223372036854775808
        self.y = -9223372036854775808

    def add(self, a, b):
        while (self.x + self.y) != (a + b):
            self.x += 1

            if (self.x == 9223372036854775807):
                self.__second_sieve()

        return self.x + self.y

    def subtract(self, a, b):
        self.x += 9223372036854775807

        while (self.x - self.y) != (a - b):
            self.x -= 1

            if (self.x == 9223372036854775807):
                self.__second_sieve()
                self.x += 9223372036854775807

        return self.x - self.y

    def multiply(self, a, b):
        self.y += 9223372036854775809

        while (self.x * self.y) != (a * b):
            self.x += 1

        return self.x * self.y

    def divide(self, a, b):
        #do some math
        while self.x != 9223372036854775807:
            self.y /= self.x
            self.x += 1

        return a/b

    def show(self):
        print("x =", self.x)
        print("y =", self.y)

    def reset(self):
        """This method makes it more like a real calcualtor where you have to clear out the screen after you use it or else it doesnt work"""
        self.x = -9223372036854775808
        self.y = -9223372036854775808

    def __second_sieve():
        self.x = 0
        self.y = 0