How many ramen reviews originally had a 'Stars' rating of 'Unrated' before it was converted to 0?

How many ramen reviews originally had a 'Stars' rating of 'Unrated' before it was converted to 0?: a task in SmolDataEnvs-harbor-train-sandbox: 📊 SmolDataEnvs: Harbor (train) (Harbor dataset). Files (in /home/user/input, no subfolders): - ramen-ratings.csv