"""
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."""

x=1000
sum=0
for each in range(1,1000):
    if(each%3==0 or each%5==0):
        sum+=each
print sum
