public static void main ( String [ ] args ) throws IOException {
  Scanner sc = new Scanner ( new FileReader ( "jam.in" ) ) ;
  BufferedWriter bw = new BufferedWriter ( new FileWriter ( "jam.out" ) ) ;
  int cases ;
  cases = sc . nextInt ( ) ;
  for ( int z = 1 ;
  z <= cases ;
  z ++ ) {
    double C = sc . nextDouble ( ) ;
    double F = sc . nextDouble ( ) ;
    double X = sc . nextDouble ( ) ;
    double product = 2 ;
    double ans = 0 ;
    while ( X / ( product + F ) + C / product < X / product ) {
      ans += C / product ;
      product += F ;
    }
    ans += X / product ;
    bw . write ( "Case #" + z + ": " ) ;
    DecimalFormat df = new DecimalFormat ( "0.00000000" ) ;
    bw . write ( "" + df . format ( ans ) + "\n" ) ;
  }
  sc . close ( ) ;
  bw . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { Scanner sc = new Scanner ( new FileReader ( " jam . in " ) ) ; BufferedWriter bw = new BufferedWriter ( new FileWriter ( " jam . out " ) ) ; int cases ; cases = sc . nextInt ( ) ; for ( int z = 1 ; z <= cases ; z ++ ) { double C = sc . nextDouble ( ) ; double F = sc . nextDouble ( ) ; double X = sc . nextDouble ( ) ; double product = 2 ; double ans = 0 ; while ( X / ( product + F ) + C / product < X / product ) { ans += C / product ; product += F ; } ans += X / product ; bw . write ( " Case ▁ # " + z + " : ▁ " ) ; DecimalFormat df = new DecimalFormat ( "0.00000000" ) ; bw . write ( " " + df . format ( ans ) + " \n " ) ; } sc . close ( ) ; bw . close ( ) ; }
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