public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int T = in . nextInt ( ) ;
  for ( int t = 0 ;
  t < T ;
  t ++ ) {
    int [ ] A = new int [ 3 ] ;
    int [ ] B = new int [ 3 ] ;
    for ( int i = 0 ;
    i < 3 ;
    i ++ ) {
      A [ i ] = in . nextInt ( ) ;
    }
    for ( int i = 0 ;
    i < 3 ;
    i ++ ) {
      B [ i ] = in . nextInt ( ) ;
    }
    int d = Math . min ( B [ 2 ] , A [ 0 ] ) ;
    B [ 2 ] -= d ;
    d = Math . min ( B [ 2 ] , A [ 2 ] ) ;
    B [ 2 ] -= d ;
    A [ 2 ] -= d ;
    int answer = 2 * ( Math . min ( A [ 2 ] , B [ 1 ] ) - B [ 2 ] ) ;
    System . out . println ( answer ) ;
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int T = in . nextInt ( ) ; for ( int t = 0 ; t < T ; t ++ ) { int [ ] A = new int [ 3 ] ; int [ ] B = new int [ 3 ] ; for ( int i = 0 ; i < 3 ; i ++ ) { A [ i ] = in . nextInt ( ) ; } for ( int i = 0 ; i < 3 ; i ++ ) { B [ i ] = in . nextInt ( ) ; } int d = Math . min ( B [ 2 ] , A [ 0 ] ) ; B [ 2 ] -= d ; d = Math . min ( B [ 2 ] , A [ 2 ] ) ; B [ 2 ] -= d ; A [ 2 ] -= d ; int answer = 2 * ( Math . min ( A [ 2 ] , B [ 1 ] ) - B [ 2 ] ) ; System . out . println ( answer ) ; } }
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