def multiples():
    """

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.
"""
    sum1 = 0
    for i in range(1, 1000):
        if(i % 3 == 0) or (i % 5 == 0):
            sum1 = sum1 + i
    print(sum1)


multiples()
