*Similarly, one can get 30 virtues by saying

وَ عَلَيْـكُمُ السَّلَامُ وَ رَحْمَةُ اللّٰهِ وَ بَرَكَاتُهٗ in reply.

  *It is Wajib [obligatory] to reply to Salaam immediately in a voice audible to the one who says Salaam.