main :: IO ()
main = do
    n <- getLine
    case n of
        "0" -> print 0
        "1" -> print 10
        "2" -> print 20
        "3" -> print 30
        "4" -> print 40
        "5" -> print 50
        "6" -> print 60
        "7" -> print 70
        "8" -> print 80
        "9" -> print 90
        "10" -> print 100