public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int [ ] b = new int [ n ] ;
  int [ ] c = new int [ n ] ;
  int [ ] d = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    b [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    c [ i ] = sc . nextInt ( ) ;
    d [ i ] = sc . nextInt ( ) ;
  }
  sortpoint ( a , b , n ) ;
  sortpoint ( c , d , n ) ;
  int ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int j = 0 ;
    int ymax = - 1 ;
    int index = - 1 ;
    while ( j < n && a [ j ] < c [ i ] ) {
      if ( a [ j ] >= 0 && b [ j ] < d [ i ] ) {
        if ( b [ j ] >= ymax ) {
          ymax = b [ j ] ;
          index = j ;
        }
      }
      j ++ ;
    }
    if ( index >= 0 ) {
      ans ++ ;
      a [ index ] = - 1 ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; int [ ] b = new int [ n ] ; int [ ] c = new int [ n ] ; int [ ] d = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; b [ i ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < n ; i ++ ) { c [ i ] = sc . nextInt ( ) ; d [ i ] = sc . nextInt ( ) ; } sortpoint ( a , b , n ) ; sortpoint ( c , d , n ) ; int ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int j = 0 ; int ymax = - 1 ; int index = - 1 ; while ( j < n && a [ j ] < c [ i ] ) { if ( a [ j ] >= 0 && b [ j ] < d [ i ] ) { if ( b [ j ] >= ymax ) { ymax = b [ j ] ; index = j ; } } j ++ ; } if ( index >= 0 ) { ans ++ ; a [ index ] = - 1 ; } } System . out . println ( ans ) ; }
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