import Control.Applicative ((<$>))

main :: IO ()
main = do
  getLine
  solve <$> getl (map read . words) >>= print

solve :: [Int] -> Int
solve xs = (* 30) $ length $ filter f xs
  where
    f x = 10 * x <= sxs
    sxs = sum xs

getl :: (String -> a) -> IO a
getl f = f <$> getLine