How many officially licensed F1 games are available for purchase on Steam?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'INTERNAL', 'name_': 'Q6581097', 'id': 1, 'label': 'male'}, {'type': 'INTERNAL', 'name_': 'Q1860', 'id': 2, 'label': 'English'}, {'type': 'INTERNAL', 'name_': 'Q42311', 'id': 3, 'label': 'Sebastian Vettel'}, {'type': 'INTERNAL', 'name_': 'Q9671', 'id': 4, 'label': 'Michael Schumacher'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1968', 'id': 5, 'label': 'Formula One'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q337535', 'id': 6, 'label': 'Steam'}, {'type': 'INTERNAL', 'name_': 'Q20970432', 'id': 7, 'label': '4:3'}, {'type': 'INTERNAL', 'name_': 'Q37123', 'id': 8, 'label': 'Sonic the Hedgehog'}, {'type': 'INTERNAL', 'name_': 'Q26185', 'id': 9, 'label': 'Quaternary'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q202', 'id': 10, 'label': '4'}, {'type': 'INTERNAL', 'name_': 'Q19559892', 'id': 11, 'label': '4mat'}], 'links': [{'name_': 'P5008', 'source': 2, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P21', 'source': 3, 'target': 1, 'label': 'sex or gender'}, {'name_': 'P1412', 'source': 3, 'target': 2, 'label': 'languages spoken, written or signed'}, {'name_': 'P641', 'source': 3, 'target': 5, 'label': 'sport'}, {'name_': 'P5008', 'source': 4, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P21', 'source': 4, 'target': 1, 'label': 'sex or gender'}, {'name_': 'P1412', 'source': 4, 'target': 2, 'label': 'languages spoken, written or signed'}, {'name_': 'P2416', 'source': 4, 'target': 5, 'label': 'sports discipline competed in'}, {'name_': 'P2936', 'source': 6, 'target': 2, 'label': 'language used'}, {'name_': 'P4934', 'source': 7, 'target': 10, 'label': 'calculated from'}, {'name_': 'P407', 'source': 8, 'target': 2, 'label': 'language of work or name'}, {'name_': 'P750', 'source': 8, 'target': 6, 'label': 'distributed by'}, {'name_': 'P2061', 'source': 8, 'target': 7, 'label': 'aspect ratio (W:H)'}, {'name_': 'P5008', 'source': 9, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P138', 'source': 9, 'target': 10, 'label': 'named after'}, {'name_': 'P21', 'source': 11, 'target': 1, 'label': 'sex or gender'}, {'name_': 'P1412', 'source': 11, 'target': 2, 'label': 'languages spoken, written or signed'}, {'name_': 'P138', 'source': 11, 'target': 10, 'label': 'named after'}]}