public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] cards = new int [ n + 2 ] ;
  for ( int i = 0 ;
  i < n + 2 ;
  i ++ ) {
    cards [ i ] = sc . nextInt ( ) ;
  }
  int [ ] [ ] mainTable = new int [ n + 2 ] [ n + 2 ] ;
  int [ ] [ ] subTable = new int [ n + 2 ] [ n + 2 ] ;
  for ( int j = 0 ;
  j < n + 1 ;
  j ++ ) {
    mainTable [ j ] [ n + 1 ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ;
    mainTable [ n + 1 ] [ j ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ;
    subTable [ j ] [ n + 1 ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ;
    subTable [ n + 1 ] [ j ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ;
  }
  for ( int i = n ;
  i >= 1 ;
  i -- ) {
    for ( int j = 0 ;
    j < i ;
    j ++ ) {
      mainTable [ i ] [ j ] = subTable [ i ] [ i + 1 ] ;
      subTable [ i ] [ j ] = Math . max ( mainTable [ i ] [ j ] , subTable [ i + 1 ] [ j ] ) ;
      mainTable [ j ] [ i ] = subTable [ i + 1 ] [ i ] ;
      subTable [ j ] [ i ] = Math . min ( mainTable [ j ] [ i ] , subTable [ j ] [ i + 1 ] ) ;
    }
  }
  System . out . println ( mainTable [ 0 ] [ 1 ] ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] cards = new int [ n + 2 ] ; for ( int i = 0 ; i < n + 2 ; i ++ ) { cards [ i ] = sc . nextInt ( ) ; } int [ ] [ ] mainTable = new int [ n + 2 ] [ n + 2 ] ; int [ ] [ ] subTable = new int [ n + 2 ] [ n + 2 ] ; for ( int j = 0 ; j < n + 1 ; j ++ ) { mainTable [ j ] [ n + 1 ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ; mainTable [ n + 1 ] [ j ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ; subTable [ j ] [ n + 1 ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ; subTable [ n + 1 ] [ j ] = Math . abs ( cards [ j ] - cards [ n + 1 ] ) ; } for ( int i = n ; i >= 1 ; i -- ) { for ( int j = 0 ; j < i ; j ++ ) { mainTable [ i ] [ j ] = subTable [ i ] [ i + 1 ] ; subTable [ i ] [ j ] = Math . max ( mainTable [ i ] [ j ] , subTable [ i + 1 ] [ j ] ) ; mainTable [ j ] [ i ] = subTable [ i + 1 ] [ i ] ; subTable [ j ] [ i ] = Math . min ( mainTable [ j ] [ i ] , subTable [ j ] [ i + 1 ] ) ; } } System . out . println ( mainTable [ 0 ] [ 1 ] ) ; }
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