public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  char [ ] s = sc . next ( ) . toCharArray ( ) ;
  for ( int a = 0 ;
  a < n ;
  a ++ ) {
    LOOP : for ( int b = 1 ;
    b < n ;
    b ++ ) {
      for ( int i = 0 ;
      i <= 4 ;
      i ++ ) {
        int x = a + b * i ;
        if ( x >= n ) {
          continue LOOP ;
        }
        if ( s [ x ] == '.' ) {
          continue LOOP ;
        }
      }
      System . out . println ( "yes" ) ;
      return ;
    }
  }
  System . out . println ( "no" ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; char [ ] s = sc . next ( ) . toCharArray ( ) ; for ( int a = 0 ; a < n ; a ++ ) { LOOP : for ( int b = 1 ; b < n ; b ++ ) { for ( int i = 0 ; i <= 4 ; i ++ ) { int x = a + b * i ; if ( x >= n ) { continue LOOP ; } if ( s [ x ] == ' . ' ) { continue LOOP ; } } System . out . println ( " yes " ) ; return ; } } System . out . println ( " no " ) ; }
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