How many of Stephen King's books have been made into movies?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q45384', 'id': 1, 'label': 'Carrie'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q39829', 'id': 2, 'label': 'Stephen King'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q833154', 'id': 3, 'label': 'Edgar Awards'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P495', 'source': 1, 'target': 0, 'label': 'country of origin'}, {'name_': 'P1877', 'source': 1, 'target': 2, 'label': 'after a work by'}, {'name_': 'P17', 'source': 3, 'target': 0, 'label': 'country'}]}