public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  List < Grid > gridList = new ArrayList < > ( ) ;
  int n = in . nextInt ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    gridList . add ( new Grid ( Color . RED , in . nextInt ( ) , in . nextInt ( ) ) ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    gridList . add ( new Grid ( Color . BLUE , in . nextInt ( ) , in . nextInt ( ) ) ) ;
  }
  gridList . sort ( Comparator . comparing ( Grid :: getX ) . thenComparing ( Grid :: getColor ) ) ;
  List < Grid > tmp = new ArrayList < > ( ) ;
  int ans = 0 ;
  for ( Grid grid : gridList ) {
    if ( grid . color == Color . RED ) {
      tmp . add ( grid ) ;
    }
    else {
      List < Grid > list = tmp . stream ( ) . filter ( g -> g . getY ( ) < grid . getY ( ) ) . collect ( Collectors . toList ( ) ) ;
      if ( list . size ( ) > 0 ) {
        ans ++ ;
        list . sort ( Comparator . comparing ( Grid :: getY ) ) ;
        tmp . remove ( list . get ( list . size ( ) - 1 ) ) ;
      }
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; List < Grid > gridList = new ArrayList < > ( ) ; int n = in . nextInt ( ) ; for ( int i = 0 ; i < n ; i ++ ) { gridList . add ( new Grid ( Color . RED , in . nextInt ( ) , in . nextInt ( ) ) ) ; } for ( int i = 0 ; i < n ; i ++ ) { gridList . add ( new Grid ( Color . BLUE , in . nextInt ( ) , in . nextInt ( ) ) ) ; } gridList . sort ( Comparator . comparing ( Grid :: getX ) . thenComparing ( Grid :: getColor ) ) ; List < Grid > tmp = new ArrayList < > ( ) ; int ans = 0 ; for ( Grid grid : gridList ) { if ( grid . color == Color . RED ) { tmp . add ( grid ) ; } else { List < Grid > list = tmp . stream ( ) . filter ( g -> g . getY ( ) < grid . getY ( ) ) . collect ( Collectors . toList ( ) ) ; if ( list . size ( ) > 0 ) { ans ++ ; list . sort ( Comparator . comparing ( Grid :: getY ) ) ; tmp . remove ( list . get ( list . size ( ) - 1 ) ) ; } } } System . out . println ( ans ) ; }
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