# If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
# Find the sum of all the multiples of 3 or 5 below 1000.

class Multiples:

    def __init__(self, num, min, max):
        self.__num = num
        self.__min = self.round_step(min)
        self.__max = max

    def round_step(self, min):
        while(min%self.__num != 0):
            min += 1
        return min

    def multiples(self):
        return range(self.__min, self.__max, self.__num)

three = Multiples(3, 1, 1000)
five = Multiples(5, 1, 1000)

print(reduce(lambda x,y: x+y, list(set(three.multiples()+five.multiples()))))