public static void main ( String ... orange ) throws Exception {
  Scanner input = new Scanner ( System . in ) ;
  int numCases = input . nextInt ( ) ;
  for ( int n = 0 ;
  n < numCases ;
  n ++ ) {
    N = input . nextInt ( ) ;
    int K = input . nextInt ( ) ;
    double [ ] ps = new double [ N ] ;
    for ( int i = 0 ;
    i < N ;
    i ++ ) ps [ i ] = input . nextDouble ( ) ;
    ans = 0 ;
    solve ( new ArrayList < Double > ( ) , ps , K , 0 ) ;
    System . out . printf ( "Case #%d: " , n + 1 ) ;
    System . out . println ( ans ) ;
  }
}

public static void main ( String ... orange ) throws Exception { Scanner input = new Scanner ( System . in ) ; int numCases = input . nextInt ( ) ; for ( int n = 0 ; n < numCases ; n ++ ) { N = input . nextInt ( ) ; int K = input . nextInt ( ) ; double [ ] ps = new double [ N ] ; for ( int i = 0 ; i < N ; i ++ ) ps [ i ] = input . nextDouble ( ) ; ans = 0 ; solve ( new ArrayList < Double > ( ) , ps , K , 0 ) ; System . out . printf ( " Case ▁ # % d : ▁ " , n + 1 ) ; System . out . println ( ans ) ; } }
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