First choose the number of cities then try to achieve the highest population among the top cities you chose. Quiz is not timed.

Southern Europe defined by UN Statistical Division – includes Albania, Andorra, Bosnia & Herz, Croatia, Gibraltar, Greece, Italy, Macedonia, Malta, Montenegro, Portugal, San Marino, Serbia, Slovenia, Spain and Vatican – I also included Kosovo as I count it as a separate country whereas the UN does not in their geoscheme. Quiz is not timed.