fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


val () =
    let
        val a = Real.fromInt(readInt ())
        val b = Real.fromInt(readInt ())
        val c = Real.fromInt(readInt ())
        
        val ans = (a / b) * c
    in
        print (Real.toString ans ^ "\n")
    end