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# Problem 1: Multiples of 3 and 5
# 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.

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