How many members are there in Blackpink?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q884', 'id': 1, 'label': 'South Korea'}, {'type': 'INTERNAL', 'name_': 'Q1186979', 'id': 2, 'label': 'Jordan Maron'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q61942967', 'id': 3, 'label': 'Diamond Play Button'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q25056945', 'id': 4, 'label': 'Blackpink'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P530', 'source': 0, 'target': 1, 'label': 'diplomatic relation'}, {'name_': 'P27', 'source': 2, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P166', 'source': 2, 'target': 3, 'label': 'award received'}, {'name_': 'P495', 'source': 4, 'target': 1, 'label': 'country of origin'}]}