How many Island countries are in Europe?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q46', 'id': 1, 'label': 'Europe'}, {'type': 'INTERNAL', 'name_': 'Q916', 'id': 2, 'label': 'Angola'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q23442', 'id': 3, 'label': 'island'}, {'type': 'INTERNAL', 'name_': 'Q922', 'id': 4, 'label': 'Brač'}, {'type': 'INTERNAL', 'name_': 'Q394067', 'id': 5, 'label': 'European people'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q6866928', 'id': 6, 'label': 'Category:European people'}], 'links': [{'name_': 'P5008', 'source': 2, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P17', 'source': 2, 'target': 2, 'label': 'country'}, {'name_': 'P172', 'source': 2, 'target': 5, 'label': 'ethnic or cultural origin'}, {'name_': 'P5008', 'source': 3, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P30', 'source': 4, 'target': 1, 'label': 'continent'}, {'name_': 'P31', 'source': 4, 'target': 3, 'label': 'instance of'}, {'name_': 'P276', 'source': 5, 'target': 1, 'label': 'location'}, {'name_': 'P910', 'source': 5, 'target': 6, 'label': "topic's main category"}]}