public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  HashMap < Point , Integer > same = new HashMap < Point , Integer > ( ) ;
  TreeMap < Integer , Integer > mapx = new TreeMap < > ( ) ;
  TreeMap < Integer , Integer > mapy = new TreeMap < > ( ) ;
  int count = 0 , extra = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int x = input . nextInt ( ) ;
    int y = input . nextInt ( ) ;
    Point p = new Point ( x , y ) ;
    same . put ( p , same . getOrDefault ( p , 0 ) + 1 ) ;
    mapx . put ( x , mapx . getOrDefault ( x , 0 ) + 1 ) ;
    mapy . put ( y , mapy . getOrDefault ( y , 0 ) + 1 ) ;
  };
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; HashMap < Point , Integer > same = new HashMap < Point , Integer > ( ) ; TreeMap < Integer , Integer > mapx = new TreeMap < > ( ) ; TreeMap < Integer , Integer > mapy = new TreeMap < > ( ) ; int count = 0 , extra = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int x = input . nextInt ( ) ; int y = input . nextInt ( ) ; Point p = new Point ( x , y ) ; same . put ( p , same . getOrDefault ( p , 0 ) + 1 ) ; mapx . put ( x , mapx . getOrDefault ( x , 0 ) + 1 ) ; mapy . put ( y , mapy . getOrDefault ( y , 0 ) + 1 ) ; } ; }
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