Question: how many books are there in the diary of a wimpy kid series
[{'answer': '12', 'provenance': [{'wikipedia_id': '18682466', 'title': 'Diary of a Wimpy Kid (book series)', 'start_paragraph_id': 65, 'start_character': 290, 'end_paragraph_id': 65, 'end_character': 292, 'bleu_score': 1.0, 'section': 'Section::::Films.\n'}]}]