If you perform one rakat salah in Al-Masjid Al-Haram you will get saoub for performing one lakh rakat salah. Accordig to hadish in mosnade ahmad & Ibne maja sharif. This saoub is not limited to only foroz salah but also for oajib, sunnat & nafol salah.
In his book "eheai ulum"Imam Gajjali note that this saoub is not only for salah but also for sadka & other good work, for all these, saoub will be increase to one lakh. So try to perform more salah & other good works there.
Reference : book- hajj, kurbani, jehad & tabligh proshongo,author- maolana muhiuddin khan, publisher- madina publications( ph 8802 7114555), page no. 14