Question: what english mathematician calculated the value of pi to 707
[{'answer': 'William Shanks', 'provenance': [{'wikipedia_id': '4416073', 'title': 'Approximations of π', 'start_paragraph_id': 3, 'start_character': 49, 'end_paragraph_id': 3, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4416073', 'title': 'Approximations of π', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 424, 'bleu_score': 0.9009864719193421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5493093522652103641}, 'section': 'Section::::16th to 19th centuries.\n'}]}]