SELECT count(*) FROM county_public_safety
Count the number of countries.
[Schema (values) (types)]: | county_public_safety |  county_public_safety : county_id (text) , name (number) , population (text) , police_officers (number) , residents_per_officer (number) , case_burden (number) , crime_rate (number) , police_force (number) , location (text) | city : city_id (text) , county_id (number) , name (text) , white (number) , black (number) , amerindian (number) , asian (number) , multiracial (number) , hispanic (text);