#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.
#Subido a repositorio. 18/04/2020.
cont = 1
sum = 0

for cont in range(1000):
    if cont % 3 == 0 or cont % 5 == 0:
        sum = sum + cont
print(sum)