public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] [ ] r = new int [ n ] [ 2 ] ;
  int [ ] [ ] b = new int [ n ] [ 2 ] ;
  boolean [ ] buse = new boolean [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    r [ i ] [ 0 ] = sc . nextInt ( ) ;
    r [ i ] [ 1 ] = sc . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    b [ i ] [ 0 ] = sc . nextInt ( ) ;
    b [ i ] [ 1 ] = sc . nextInt ( ) ;
    buse [ i ] = false ;
  }
  sc . close ( ) ;
  int ans = 0 ;
  MyComp comp = new MyComp ( ) ;
  Arrays . sort ( r , comp ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int rx = r [ n - i - 1 ] [ 0 ] ;
    int ry = r [ n - i - 1 ] [ 1 ] ;
    int bymin = 1000 ;
    int byminpos = 0 ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( b [ j ] [ 0 ] > rx && b [ j ] [ 1 ] > ry && b [ j ] [ 1 ] < bymin && ! buse [ j ] ) {
        bymin = b [ j ] [ 1 ] ;
        byminpos = j ;
      }
    }
    if ( bymin != 1000 ) {
      ans ++ ;
      buse [ byminpos ] = true ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] [ ] r = new int [ n ] [ 2 ] ; int [ ] [ ] b = new int [ n ] [ 2 ] ; boolean [ ] buse = new boolean [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { r [ i ] [ 0 ] = sc . nextInt ( ) ; r [ i ] [ 1 ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < n ; i ++ ) { b [ i ] [ 0 ] = sc . nextInt ( ) ; b [ i ] [ 1 ] = sc . nextInt ( ) ; buse [ i ] = false ; } sc . close ( ) ; int ans = 0 ; MyComp comp = new MyComp ( ) ; Arrays . sort ( r , comp ) ; for ( int i = 0 ; i < n ; i ++ ) { int rx = r [ n - i - 1 ] [ 0 ] ; int ry = r [ n - i - 1 ] [ 1 ] ; int bymin = 1000 ; int byminpos = 0 ; for ( int j = 0 ; j < n ; j ++ ) { if ( b [ j ] [ 0 ] > rx && b [ j ] [ 1 ] > ry && b [ j ] [ 1 ] < bymin && ! buse [ j ] ) { bymin = b [ j ] [ 1 ] ; byminpos = j ; } } if ( bymin != 1000 ) { ans ++ ; buse [ byminpos ] = true ; } } System . out . println ( ans ) ; }
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