public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = scanner . nextInt ( ) ;
  long [ ] a = new long [ n * 3 ] ;
  for ( int i = 0 ;
  i < 3 * n ;
  ++ i ) {
    a [ i ] = scanner . nextLong ( ) ;
  }
  final PriorityQueue < Long > firstHalf = new PriorityQueue < > ( ) ;
  final PriorityQueue < Long > secondHalf = new PriorityQueue < > ( Comparator . reverseOrder ( ) ) ;
  long [ ] leftSum = new long [ n + 1 ] ;
  long [ ] rightSum = new long [ n + 1 ] ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    firstHalf . add ( a [ i ] ) ;
    leftSum [ 0 ] += a [ i ] ;
  }
  for ( int i = n ;
  i < 2 * n ;
  ++ i ) {
    firstHalf . add ( a [ i ] ) ;
    long head = firstHalf . poll ( ) ;
    leftSum [ i - n + 1 ] = leftSum [ i - n ] + a [ i ] - head ;
  }
  for ( int i = 3 * n - 1 ;
  i >= 2 * n ;
  -- i ) {
    secondHalf . add ( a [ i ] ) ;
    rightSum [ n ] += a [ i ] ;
  }
  for ( int i = 2 * n - 1 ;
  i >= n ;
  -- i ) {
    secondHalf . add ( a [ i ] ) ;
    long head = secondHalf . poll ( ) ;
    rightSum [ i - n ] = rightSum [ i - n + 1 ] + a [ i ] - head ;
  }
  long result = Long . MIN_VALUE ;
  for ( int i = 0 ;
  i <= n ;
  ++ i ) {
    result = Math . max ( result , leftSum [ i ] - rightSum [ i ] ) ;
  }
  System . out . println ( result ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = scanner . nextInt ( ) ; long [ ] a = new long [ n * 3 ] ; for ( int i = 0 ; i < 3 * n ; ++ i ) { a [ i ] = scanner . nextLong ( ) ; } final PriorityQueue < Long > firstHalf = new PriorityQueue < > ( ) ; final PriorityQueue < Long > secondHalf = new PriorityQueue < > ( Comparator . reverseOrder ( ) ) ; long [ ] leftSum = new long [ n + 1 ] ; long [ ] rightSum = new long [ n + 1 ] ; for ( int i = 0 ; i < n ; ++ i ) { firstHalf . add ( a [ i ] ) ; leftSum [ 0 ] += a [ i ] ; } for ( int i = n ; i < 2 * n ; ++ i ) { firstHalf . add ( a [ i ] ) ; long head = firstHalf . poll ( ) ; leftSum [ i - n + 1 ] = leftSum [ i - n ] + a [ i ] - head ; } for ( int i = 3 * n - 1 ; i >= 2 * n ; -- i ) { secondHalf . add ( a [ i ] ) ; rightSum [ n ] += a [ i ] ; } for ( int i = 2 * n - 1 ; i >= n ; -- i ) { secondHalf . add ( a [ i ] ) ; long head = secondHalf . poll ( ) ; rightSum [ i - n ] = rightSum [ i - n + 1 ] + a [ i ] - head ; } long result = Long . MIN_VALUE ; for ( int i = 0 ; i <= n ; ++ i ) { result = Math . max ( result , leftSum [ i ] - rightSum [ i ] ) ; } System . out . println ( result ) ; }
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