public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  String a = input . next ( ) ;
  String b = input . next ( ) ;
  int [ ] sum = new int [ 2 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    sum [ a . charAt ( i ) - '0' ] ++ ;
  }
  long count = 0 ;
  long one = 0 ;
  long zero = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( b . charAt ( i ) == '0' ) {
      if ( a . charAt ( i ) == '0' ) {
        count += sum [ 1 ] - one ;
        zero ++ ;
      }
      else {
        count += sum [ 0 ] - zero ;
        one ++ ;
      }
    }
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; String a = input . next ( ) ; String b = input . next ( ) ; int [ ] sum = new int [ 2 ] ; for ( int i = 0 ; i < n ; i ++ ) { sum [ a . charAt ( i ) - '0' ] ++ ; } long count = 0 ; long one = 0 ; long zero = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( b . charAt ( i ) == '0' ) { if ( a . charAt ( i ) == '0' ) { count += sum [ 1 ] - one ; zero ++ ; } else { count += sum [ 0 ] - zero ; one ++ ; } } } System . out . println ( count ) ; }
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