#
# 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.
#
# Answer: 233168
#

sum = 0
for i in range(1000):
	if (i%3 == 0) or (i%5 == 0):
		sum += i
print sum