Problem
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.

代碼:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
sum = 0
for i in range(1,1000):
    if( i % 3 == 0) or (i % 5 == 0):
        sum += i
        # print i,
print sum