#!/usr/bin/env python

# 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.

def main_alt():
    mSum=0
    for i in xrange (1,1001):
        if (0==i%3 or 0==i%5):
            mSum+=i

    print mSum

def main():
    print sum([i for i in xrange(1,1000) if (0==i%3 or 0==i%5)])

if __name__ == "__main__":
    main()    