How many officially licensed F1 games are available for purchase on Steam?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q1968', 'id': 0, 'label': 'Formula One'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q337535', 'id': 1, 'label': 'Steam'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q750553', 'id': 2, 'label': 'Brazilian Portuguese'}, {'type': 'INTERNAL', 'name_': 'Q82652', 'id': 3, 'label': 'Felipe Massa'}], 'links': [{'name_': 'P2936', 'source': 1, 'target': 2, 'label': 'language used'}, {'name_': 'P1344', 'source': 3, 'target': 0, 'label': 'participant in'}, {'name_': 'P1412', 'source': 3, 'target': 2, 'label': 'languages spoken, written or signed'}]}