public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int x = sc . nextInt ( ) ;
  int y = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int [ ] b = new int [ m ] ;
  Pair [ ] pairs = new Pair [ n + m ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    Pair ps = new Pair ( ) ;
    ps . start = a [ i ] ;
    ps . goal = a [ i ] + x ;
    ps . dir = 1 ;
    pairs [ i ] = ps ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    b [ i ] = sc . nextInt ( ) ;
    Pair ps = new Pair ( ) ;
    ps . start = b [ i ] ;
    ps . goal = b [ i ] + y ;
    ps . dir = - 1 ;
    pairs [ i + n ] = ps ;
  }
  Arrays . sort ( pairs ) ;
  int count = 0 ;
  int t = 0 ;
  int nowdir = 1 ;
  for ( int i = 0 ;
  i < n + m ;
  i ++ ) {
    int start = pairs [ i ] . start ;
    int goal = pairs [ i ] . goal ;
    int dir = pairs [ i ] . dir ;
    if ( t <= start && nowdir == dir ) {
      count ++ ;
      t = goal ;
      nowdir *= - 1 ;
    }
  }
  System . out . println ( count / 2 ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int x = sc . nextInt ( ) ; int y = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; int [ ] b = new int [ m ] ; Pair [ ] pairs = new Pair [ n + m ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; Pair ps = new Pair ( ) ; ps . start = a [ i ] ; ps . goal = a [ i ] + x ; ps . dir = 1 ; pairs [ i ] = ps ; } for ( int i = 0 ; i < m ; i ++ ) { b [ i ] = sc . nextInt ( ) ; Pair ps = new Pair ( ) ; ps . start = b [ i ] ; ps . goal = b [ i ] + y ; ps . dir = - 1 ; pairs [ i + n ] = ps ; } Arrays . sort ( pairs ) ; int count = 0 ; int t = 0 ; int nowdir = 1 ; for ( int i = 0 ; i < n + m ; i ++ ) { int start = pairs [ i ] . start ; int goal = pairs [ i ] . goal ; int dir = pairs [ i ] . dir ; if ( t <= start && nowdir == dir ) { count ++ ; t = goal ; nowdir *= - 1 ; } } System . out . println ( count / 2 ) ; }
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