import Control.Applicative
import Control.Monad

main :: IO ()
main = do
  n <- readLn
  solve <$> replicateM (n + 1) readLn <*> replicateM (n + 1) readLn >>= print

solve :: [Int] -> [Int] -> Int
solve as bs = f 0 (sum as `mod` pn) (reverse as) bs
  where
    pn = 10 ^ 9 + 7
    f sm sa (a:as) (b:bs) = f ((sm + (b * sa `mod` pn)) `mod` pn) (sa - a) as bs
    f sm sa [] [] = sm