Nationals of the State of either Party, holding a valid diplomatic or official passport, shall be exempted from a visa requirement to enter, transit through and stay in the territory of the State of the other Party for a period not exceeding 90 (ninety) days during any period of 180 (one hundred and eighty) days following the date of their first entry, providing that they do not engage in a gainful activity, including self- employment or any other form of private paid activity in the territory of the State of the other Party.