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 ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < M ;
  i ++ ) {
    b [ i ] = sc . nextInt ( ) ;
  }
  int ans = 0 ;
  int time = 0 ;
  while ( true ) {
    int aIndex = binarySearch ( a , time ) ;
    if ( aIndex >= N ) {
      break ;
    }
    time = a [ aIndex ] + X ;
    int bIndex = binarySearch ( b , time ) ;
    if ( bIndex >= M ) {
      break ;
    }
    time = b [ bIndex ] + Y ;
    ans ++ ;
  }
  out . println ( ans ) ;
}

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 ] ; for ( int i = 0 ; i < N ; i ++ ) { a [ i ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < M ; i ++ ) { b [ i ] = sc . nextInt ( ) ; } int ans = 0 ; int time = 0 ; while ( true ) { int aIndex = binarySearch ( a , time ) ; if ( aIndex >= N ) { break ; } time = a [ aIndex ] + X ; int bIndex = binarySearch ( b , time ) ; if ( bIndex >= M ) { break ; } time = b [ bIndex ] + Y ; ans ++ ; } out . println ( ans ) ; }
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