public static void main ( String [ ] srgs ) {
  Scanner nik = new Scanner ( System . in ) ;
  int n = nik . nextInt ( ) ;
  HashMap < String , Long > ht = new HashMap < > ( ) ;
  String s = nik . next ( ) ;
  String s1 = nik . next ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String temp = s . charAt ( i ) + "$" + s1 . charAt ( i ) ;
    ht . put ( temp , ht . getOrDefault ( temp , 0L ) + 1 ) ;
  }
  long res = 0 ;
  for ( String val : ht . keySet ( ) ) {
    long g = ht . get ( val ) ;
    if ( val . endsWith ( "0$0" ) ) {
      long g1 = ht . getOrDefault ( "1$0" , 0L ) ;
      long g2 = ht . getOrDefault ( "1$1" , 0L ) ;
      res += ( g1 * g ) ;
      res += ( g2 * g ) ;
    }
    if ( val . endsWith ( "0$1" ) ) {
      long g1 = ht . getOrDefault ( "1$0" , 0L ) ;
      res += ( g1 * g ) ;
    }
  }
  System . out . println ( res ) ;
}

public static void main ( String [ ] srgs ) { Scanner nik = new Scanner ( System . in ) ; int n = nik . nextInt ( ) ; HashMap < String , Long > ht = new HashMap < > ( ) ; String s = nik . next ( ) ; String s1 = nik . next ( ) ; for ( int i = 0 ; i < n ; i ++ ) { String temp = s . charAt ( i ) + " $ " + s1 . charAt ( i ) ; ht . put ( temp , ht . getOrDefault ( temp , 0L ) + 1 ) ; } long res = 0 ; for ( String val : ht . keySet ( ) ) { long g = ht . get ( val ) ; if ( val . endsWith ( "0 $ 0" ) ) { long g1 = ht . getOrDefault ( "1 $ 0" , 0L ) ; long g2 = ht . getOrDefault ( "1 $ 1" , 0L ) ; res += ( g1 * g ) ; res += ( g2 * g ) ; } if ( val . endsWith ( "0 $ 1" ) ) { long g1 = ht . getOrDefault ( "1 $ 0" , 0L ) ; res += ( g1 * g ) ; } } System . out . println ( res ) ; }
(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)))) (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)) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (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 (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (string_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal))) right: (decimal_integer_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (enhanced_for_statement type: (type_identifier) name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (decimal_integer_literal))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))) (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))