Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE county_public_safety (county_ID VARCHAR, population INTEGER); CREATE TABLE city (county_ID VARCHAR, population INTEGER)
### Question:
Show the number of cities in counties that have a population more than 20000.
### Answer:
SELECT COUNT(*) FROM city WHERE county_ID IN (SELECT county_ID FROM county_public_safety WHERE population > 20000)