public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int tcc = sc . nextInt ( ) ;
  for ( int tc = 1 ;
  tc <= tcc ;
  ++ tc ) {
    int n = sc . nextInt ( ) ;
    Kid [ ] kids = new Kid [ n ] ;
    for ( int i = 0 ;
    i < n ;
    ++ i ) kids [ i ] = new Kid ( i + 1 ) ;
    for ( int i = 0 ;
    i < n ;
    ++ i ) kids [ i ] . bff = kids [ sc . nextInt ( ) - 1 ] ;
    int maxCycle = 0 ;
    for ( Kid first : kids ) {
      Set < Kid > set = new HashSet < Kid > ( ) ;
      Kid k = first ;
      for ( ;
      ;
      ) {
        if ( set . contains ( k ) ) {
          if ( k == first ) {
            first . cycle = set . size ( ) ;
            maxCycle = Math . max ( maxCycle , first . cycle ) ;
          }
          break ;
        }
        set . add ( k ) ;
        k = k . bff ;
      }
    }
    for ( Kid first : kids ) {
      Set < Kid > set = new HashSet < Kid > ( ) ;
      Kid k = first ;
      for ( ;
      ;
      ) {
        if ( set . contains ( k ) ) {
          if ( k . cycle == 2 ) {
            k . brings = Math . max ( k . brings , set . size ( ) - 1 ) ;
          }
          break ;
        }
        set . add ( k ) ;
        k = k . bff ;
      }
    }
    int brings = 0 ;
    for ( Kid k : kids ) if ( k . cycle == 2 ) brings += k . brings ;
    System . out . printf ( "Case #%d: %d%n" , tc , Math . max ( maxCycle , brings ) ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int tcc = sc . nextInt ( ) ; for ( int tc = 1 ; tc <= tcc ; ++ tc ) { int n = sc . nextInt ( ) ; Kid [ ] kids = new Kid [ n ] ; for ( int i = 0 ; i < n ; ++ i ) kids [ i ] = new Kid ( i + 1 ) ; for ( int i = 0 ; i < n ; ++ i ) kids [ i ] . bff = kids [ sc . nextInt ( ) - 1 ] ; int maxCycle = 0 ; for ( Kid first : kids ) { Set < Kid > set = new HashSet < Kid > ( ) ; Kid k = first ; for ( ; ; ) { if ( set . contains ( k ) ) { if ( k == first ) { first . cycle = set . size ( ) ; maxCycle = Math . max ( maxCycle , first . cycle ) ; } break ; } set . add ( k ) ; k = k . bff ; } } for ( Kid first : kids ) { Set < Kid > set = new HashSet < Kid > ( ) ; Kid k = first ; for ( ; ; ) { if ( set . contains ( k ) ) { if ( k . cycle == 2 ) { k . brings = Math . max ( k . brings , set . size ( ) - 1 ) ; } break ; } set . add ( k ) ; k = k . bff ; } } int brings = 0 ; for ( Kid k : kids ) if ( k . cycle == 2 ) brings += k . brings ; System . out . printf ( " Case ▁ # % d : ▁ % d % n " , tc , Math . max ( maxCycle , brings ) ) ; } }
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