{-# LANGUAGE MagicHash #-}
{-# OPTIONS -fglasgow-exts #-}

import Data.Array.Vector
import Data.Word
import GHC.Prim
import GHC.Base (Int(..))
import GHC.Float(Double(..),Float(..))

n = 40000000

main = do
      let c = replicateU n (2::Word)
          a = mapU fromIntegral (enumFromToU 0 (n-1) ) :: UArr Word
      print (sumU (zipWithU (*) c a))

            -- realToFrac here misses are rule with 6.8.2