#https://projecteuler.net/problem=1
#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.
maxValue = 1000

sum = 0
i = 1

while i < maxValue:
    if i % 3 == 0:
        sum += i
    elif i % 5 == 0:
        sum += i
    i += 1

print("Sum: %d" % sum)


