import Control.Applicative
import Control.Monad
import System.IO
import Data.Char
import Data.List

main :: IO ()
main = do
    h_temp <- getLine
    let h = map read $ words h_temp :: [Int]
    word <- getLine
    let doIt c = let i = ord c - ord 'a' in h !! i
    let mh = maximum $ map doIt word
    putStrLn $ show $ length word * mh

getMultipleLines :: Int -> IO [String]

getMultipleLines n
    | n <= 0 = return []
    | otherwise = do          
        x <- getLine         
        xs <- getMultipleLines (n-1)    
        let ret = (x:xs)    
        return ret