public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  HashMap < Point , Integer > ps = new HashMap < Point , Integer > ( ) ;
  HashMap < Integer , Integer > xs = new HashMap < Integer , Integer > ( ) ;
  HashMap < Integer , Integer > ys = new HashMap < Integer , Integer > ( ) ;
  long sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int x = sc . nextInt ( ) ;
    int y = sc . nextInt ( ) ;
    Point p = new Point ( x , y ) ;
    if ( ps . containsKey ( p ) ) {
      sum -= ps . get ( p ) ;
      ps . put ( p , ps . get ( p ) + 1 ) ;
    }
    else {
      ps . put ( p , 1 ) ;
    }
    if ( xs . containsKey ( x ) ) {
      sum += xs . get ( x ) ;
      xs . put ( x , xs . get ( x ) + 1 ) ;
    }
    else {
      xs . put ( x , 1 ) ;
    }
    if ( ys . containsKey ( y ) ) {
      sum += ys . get ( y ) ;
      ys . put ( y , ys . get ( y ) + 1 ) ;
    }
    else {
      ys . put ( y , 1 ) ;
    }
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; HashMap < Point , Integer > ps = new HashMap < Point , Integer > ( ) ; HashMap < Integer , Integer > xs = new HashMap < Integer , Integer > ( ) ; HashMap < Integer , Integer > ys = new HashMap < Integer , Integer > ( ) ; long sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int x = sc . nextInt ( ) ; int y = sc . nextInt ( ) ; Point p = new Point ( x , y ) ; if ( ps . containsKey ( p ) ) { sum -= ps . get ( p ) ; ps . put ( p , ps . get ( p ) + 1 ) ; } else { ps . put ( p , 1 ) ; } if ( xs . containsKey ( x ) ) { sum += xs . get ( x ) ; xs . put ( x , xs . get ( x ) + 1 ) ; } else { xs . put ( x , 1 ) ; } if ( ys . containsKey ( y ) ) { sum += ys . get ( y ) ; ys . put ( y , ys . get ( y ) + 1 ) ; } else { ys . put ( y , 1 ) ; } } System . out . println ( sum ) ; }
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(local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: 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