What is the total number of observations in the final combined dataset after merging New York and Los…

What is the total number of observations in the final combined dataset after merging New York and Los…: a task in SmolDataEnvs-harbor-train (Harbor dataset). Files (in /home/user/input, no subfolders): - new-york 9-24-2016 9-30-2017.csv - los-angeles 9-24-2016 9-30-2017.csv