import           Data.Maybe
import qualified Data.ByteString.Char8         as C8

getInts :: IO [Int]
getInts = fmap (map (fst . fromJust . C8.readInt) . C8.words) C8.getLine

main :: IO ()
main = do
    _  <- getLine
    as <- getInts
    print $ foldl1 gcd as
