Question: how many countries are taking part in the eurovision 2017
[{'answer': 'Forty - two', 'provenance': [{'wikipedia_id': '49778373', 'title': 'Eurovision Song Contest 2017', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49778373', 'title': 'Eurovision Song Contest 2017', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 478, 'bleu_score': 0.8059749101594821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7540664159242635225}, 'section': 'Section::::Abstract.'}]}]