fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


val () =
    let
        val s = readStr ()
        val sub = Substring.full s
        val (first, _) = Substring.splitl (fn c => c <> #"/") sub
        val (_, second) = Substring.splitr (fn c => c <> #"/") sub
        val a = Real.fromInt (valOf (Int.fromString (Substring.string first)))
        val b = Real.fromInt (valOf (Int.fromString (Substring.string second)))
                                 
        val ans = a / b
    in
        print ((Real.fmt (StringCvt.FIX (SOME 4)) ans) ^ "\n")
    end