Q: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Passage: The university runs a number of academic institutions and programs apart from its undergraduate and postgraduate schools. It operates the University of Chicago Laboratory Schools (a private day school for K-12 students and day care), the Sonia Shankman Orthogenic School (a residential treatment program for those with behavioral and emotional problems), and four public charter schools on the South Side of Chicago administered by the university's Urban Education Institute. In addition, the Hyde Park Day School, a school for students with learning disabilities, maintains a location on the University of Chicago campus. Since 1983, the University of Chicago has maintained the University of Chicago School Mathematics Project, a mathematics program used in urban primary and secondary schools. The university runs a program called the Council on Advanced Studies in the Social Sciences and Humanities, which administers interdisciplinary workshops to provide a forum for graduate students, faculty, and visiting scholars to present scholarly work in progress. The university also operates the University of Chicago Press, the largest university press in the United States. Question: How many public charter schools does the university run?
A:
four