public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringBuilder sb = new StringBuilder ( ) ;
  int n = Integer . parseInt ( br . readLine ( ) ) ;
  long a1 = 0 , a0 = 0 , b1 = 0 , b0 = 0 ;
  String sr = br . readLine ( ) ;
  String ss = br . readLine ( ) ;
  long count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( sr . charAt ( i ) == '1' ) {
      a1 ++ ;
      if ( ss . charAt ( i ) == '1' ) b1 ++ ;
    }
    if ( sr . charAt ( i ) == '0' ) {
      a0 ++ ;
      if ( ss . charAt ( i ) == '0' ) b0 ++ ;
    }
  }
  count += a1 * b0 ;
  count += ( a1 - b1 ) * ( a0 - b0 ) ;
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringBuilder sb = new StringBuilder ( ) ; int n = Integer . parseInt ( br . readLine ( ) ) ; long a1 = 0 , a0 = 0 , b1 = 0 , b0 = 0 ; String sr = br . readLine ( ) ; String ss = br . readLine ( ) ; long count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( sr . charAt ( i ) == '1' ) { a1 ++ ; if ( ss . charAt ( i ) == '1' ) b1 ++ ; } if ( sr . charAt ( i ) == '0' ) { a0 ++ ; if ( ss . charAt ( i ) == '0' ) b0 ++ ; } } count += a1 * b0 ; count += ( a1 - b1 ) * ( a0 - b0 ) ; System . out . println ( count ) ; }
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