public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = Integer . parseInt ( sc . next ( ) ) ;
  int [ ] [ ] red = new int [ n ] [ 2 ] ;
  int [ ] [ ] blue = new int [ n ] [ 2 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    red [ i ] [ 0 ] = Integer . parseInt ( sc . next ( ) ) ;
    red [ i ] [ 1 ] = Integer . parseInt ( sc . next ( ) ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    blue [ i ] [ 0 ] = Integer . parseInt ( sc . next ( ) ) ;
    blue [ i ] [ 1 ] = Integer . parseInt ( sc . next ( ) ) ;
  }
  Arrays . sort ( red , ( a , b ) -> Integer . compare ( a [ 0 ] , b [ 0 ] ) ) ;
  Arrays . sort ( blue , ( a , b ) -> Integer . compare ( a [ 0 ] , b [ 0 ] ) ) ;
  System . out . println ( calc ( red , blue , n ) ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = Integer . parseInt ( sc . next ( ) ) ; int [ ] [ ] red = new int [ n ] [ 2 ] ; int [ ] [ ] blue = new int [ n ] [ 2 ] ; for ( int i = 0 ; i < n ; i ++ ) { red [ i ] [ 0 ] = Integer . parseInt ( sc . next ( ) ) ; red [ i ] [ 1 ] = Integer . parseInt ( sc . next ( ) ) ; } for ( int i = 0 ; i < n ; i ++ ) { blue [ i ] [ 0 ] = Integer . parseInt ( sc . next ( ) ) ; blue [ i ] [ 1 ] = Integer . parseInt ( sc . next ( ) ) ; } Arrays . sort ( red , ( a , b ) -> Integer . compare ( a [ 0 ] , b [ 0 ] ) ) ; Arrays . sort ( blue , ( a , b ) -> Integer . compare ( a [ 0 ] , b [ 0 ] ) ) ; System . out . println ( calc ( red , blue , n ) ) ; sc . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier)) dimensions: (dimensions_expr (decimal_integer_literal))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier)) dimensions: (dimensions_expr (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: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (lambda_expression parameters: (inferred_parameters (identifier) (identifier)) body: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)) (array_access array: (identifier) index: (decimal_integer_literal)))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (lambda_expression parameters: (inferred_parameters (identifier) (identifier)) body: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)) (array_access array: (identifier) index: (decimal_integer_literal)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier) (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))