Euler 1

欧拉项目第一题：

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.

temp = 0
for i in range(1000):
    if i%3 == 0:
        temp += i
    elif i%5 == 0:
        temp += i
    elif i%15 == 0:
        temp -= i
print temp

以上是第一种解法,第二种解法较简洁

print sum(x for x in xrange(1000) if not x % 3 or not x % 5)