Question: how many times has christopher walken been on snl
[{'answer': '7', 'provenance': [{'wikipedia_id': '27490105', 'title': 'List of Saturday Night Live guests', 'start_paragraph_id': 1, 'start_character': 189, 'end_paragraph_id': 1, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]