{-
 - Project Euler 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.
 -
 - solution by nathan dotz
 - nathan (period) dotz (at sign) gmail (period) com
 -}

main = putStrLn $ "Sum of all multiples of 3 or 5 below 1000: "
         ++ show ( sum [ x | x<-[1..999], x `mod` 3 == 0 || x `mod` 5 == 0] )