Problem 1

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.


My Solution:

#Find the sum of all the multiples of 3 or 5 below 1000.
s=0
for i in range(1,334):
    if 3*i < 1000:
        s = s + 3*i
    if 5*i <; 1000 and 5*i % 3 != 0:
        s=s+5*i
print s