public static void main ( String args [ ] ) {
  FastScanner scanner = new FastScanner ( System . in ) ;
  PrintWriter printer = new PrintWriter ( System . out ) ;
  int n = scanner . nextInt ( ) ;
  String s = scanner . next ( ) ;
  for ( int k = 1 ;
  k < n ;
  k ++ ) {
    for ( int i = 0 ;
    ;
    i ++ ) {
      if ( i + k * 4 >= n ) {
        break ;
      }
      boolean c1 = s . charAt ( i ) == '*' ;
      boolean c2 = s . charAt ( i + k ) == '*' ;
      boolean c3 = s . charAt ( i + k * 2 ) == '*' ;
      boolean c4 = s . charAt ( i + k * 3 ) == '*' ;
      boolean c5 = s . charAt ( i + k * 4 ) == '*' ;
      if ( c1 && c2 && c3 && c4 && c5 ) {
        printer . println ( "yes" ) ;
        printer . close ( ) ;
        return ;
      }
    }
  }
  printer . println ( "no" ) ;
  printer . close ( ) ;
}

public static void main ( String args [ ] ) { FastScanner scanner = new FastScanner ( System . in ) ; PrintWriter printer = new PrintWriter ( System . out ) ; int n = scanner . nextInt ( ) ; String s = scanner . next ( ) ; for ( int k = 1 ; k < n ; k ++ ) { for ( int i = 0 ; ; i ++ ) { if ( i + k * 4 >= n ) { break ; } boolean c1 = s . charAt ( i ) == ' * ' ; boolean c2 = s . charAt ( i + k ) == ' * ' ; boolean c3 = s . charAt ( i + k * 2 ) == ' * ' ; boolean c4 = s . charAt ( i + k * 3 ) == ' * ' ; boolean c5 = s . charAt ( i + k * 4 ) == ' * ' ; if ( c1 && c2 && c3 && c4 && c5 ) { printer . println ( " yes " ) ; printer . close ( ) ; return ; } } } printer . println ( " no " ) ; printer . close ( ) ; }
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