public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int n = scan . nextInt ( ) ;
  int k = scan . nextInt ( ) ;
  long p = scan . nextLong ( ) ;
  long [ ] pos = new long [ n ] ;
  long [ ] key = new long [ k ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    pos [ i ] = scan . nextLong ( ) ;
  }
  for ( int i = 0 ;
  i < k ;
  i ++ ) {
    key [ i ] = scan . nextLong ( ) ;
  }
  Arrays . sort ( pos ) ;
  Arrays . sort ( key ) ;
  long min = Long . MAX_VALUE ;
  long [ ] d = new long [ n ] ;
  int number = k - n + 1 ;
  long max = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    d [ i ] = Math . abs ( pos [ i ] - key [ i ] ) + Math . abs ( key [ i ] - p ) ;
    max = Math . max ( max , d [ i ] ) ;
  }
  min = Math . min ( min , max ) ;
  for ( int i = 1 ;
  i < number ;
  i ++ ) {
    max = 0 ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      d [ j ] = Math . abs ( pos [ j ] - key [ i + j ] ) + Math . abs ( key [ i + j ] - p ) ;
      max = Math . max ( max , d [ j ] ) ;
    }
    min = Math . min ( min , max ) ;
  }
  System . out . println ( min ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int n = scan . nextInt ( ) ; int k = scan . nextInt ( ) ; long p = scan . nextLong ( ) ; long [ ] pos = new long [ n ] ; long [ ] key = new long [ k ] ; for ( int i = 0 ; i < n ; i ++ ) { pos [ i ] = scan . nextLong ( ) ; } for ( int i = 0 ; i < k ; i ++ ) { key [ i ] = scan . nextLong ( ) ; } Arrays . sort ( pos ) ; Arrays . sort ( key ) ; long min = Long . MAX_VALUE ; long [ ] d = new long [ n ] ; int number = k - n + 1 ; long max = 0 ; for ( int i = 0 ; i < n ; i ++ ) { d [ i ] = Math . abs ( pos [ i ] - key [ i ] ) + Math . abs ( key [ i ] - p ) ; max = Math . max ( max , d [ i ] ) ; } min = Math . min ( min , max ) ; for ( int i = 1 ; i < number ; i ++ ) { max = 0 ; for ( int j = 0 ; j < n ; j ++ ) { d [ j ] = Math . abs ( pos [ j ] - key [ i + j ] ) + Math . abs ( key [ i + j ] - p ) ; max = Math . max ( max , d [ j ] ) ; } min = Math . min ( min , max ) ; } System . out . println ( min ) ; }
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