public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int n = in . nextInt ( ) , i ;
  String a = in . next ( ) , b = in . next ( ) ;
  in . close ( ) ;
  long z = 0 , oz = 0 , oo = 0 , zz = 0 ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    if ( a . charAt ( i ) == '0' ) z ++ ;
    if ( a . charAt ( i ) == '1' && b . charAt ( i ) == '0' ) oz ++ ;
    if ( a . charAt ( i ) == '1' && b . charAt ( i ) == '1' ) oo ++ ;
    if ( a . charAt ( i ) == '0' && b . charAt ( i ) == '0' ) zz ++ ;
  }
  System . out . println ( oo * zz + oz * z ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int n = in . nextInt ( ) , i ; String a = in . next ( ) , b = in . next ( ) ; in . close ( ) ; long z = 0 , oz = 0 , oo = 0 , zz = 0 ; for ( i = 0 ; i < n ; i ++ ) { if ( a . charAt ( i ) == '0' ) z ++ ; if ( a . charAt ( i ) == '1' && b . charAt ( i ) == '0' ) oz ++ ; if ( a . charAt ( i ) == '1' && b . charAt ( i ) == '1' ) oo ++ ; if ( a . charAt ( i ) == '0' && b . charAt ( i ) == '0' ) zz ++ ; } System . out . println ( oo * zz + oz * z ) ; }
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