List the report number of crimes reported in a community area in the far north side with a population greater than 60,000.
report number refers to report_no; the far north side refers to side = 'Far North'; population greater than 60,000 refers to population > '60000'
SELECT SUM(CASE WHEN T1.population > 60000 THEN 1 ELSE 0 END) FROM Community_Area AS T1 INNER JOIN Crime AS T2 ON T2.community_area_no = T1.community_area_no WHERE T1.side = 'Far North '