public static void main ( String [ ] args ) {
  FastScanner in = new FastScanner ( ) ;
  FastWriter out = new FastWriter ( ) ;
  int n = in . nextInt ( ) ;
  String [ ] str1 = in . next ( ) . split ( "" ) ;
  String [ ] str2 = in . next ( ) . split ( "" ) ;
  int cnt = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int diff = Math . abs ( Integer . parseInt ( str1 [ i ] ) - Integer . parseInt ( str2 [ i ] ) ) ;
    if ( diff <= 5 ) {
      cnt += diff ;
    }
    else {
      cnt += 10 - diff ;
    }
  }
  out . println ( cnt ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) { FastScanner in = new FastScanner ( ) ; FastWriter out = new FastWriter ( ) ; int n = in . nextInt ( ) ; String [ ] str1 = in . next ( ) . split ( " " ) ; String [ ] str2 = in . next ( ) . split ( " " ) ; int cnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int diff = Math . abs ( Integer . parseInt ( str1 [ i ] ) - Integer . parseInt ( str2 [ i ] ) ) ; if ( diff <= 5 ) { cnt += diff ; } else { cnt += 10 - diff ; } } out . println ( cnt ) ; out . close ( ) ; }
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