How many are the total winners from South Korea?
{'header': ['Country', 'Mens Open', 'Womens Open', 'Mens Wheelchair', 'Womens Wheelchair', 'Total'], 'page_title': 'List of winners of the Boston Marathon', 'section_title': 'Victories by nationality', 'caption': 'Victories by nationality', 'rows': [['United States', '44', '15', '12', '25', '96'], ['Kenya', '20', '10', '0', '0', '30'], ['Canada', '16', '1', '4', '0', '21'], ['Japan', '8', '0', '3', '5', '16'], ['Switzerland', '0', '0', '7', '2', '9'], ['South Africa', '0', '0', '9', '0', '9'], ['Ethiopia', '4', '4', '0', '0', '8'], ['Finland', '7', '0', '0', '0', '7'], ['Germany', '1', '5', '0', '0', '6'], ['Australia', '1', '0', '0', '4', '5'], ['Russia', '0', '4', '0', '0', '4'], ['France', '0', '0', '3', '0', '3'], ['New Zealand', '1', '2', '0', '0', '3'], ['Portugal', '0', '3', '0', '0', '3'], ['South Korea', '3', '0', '0', '0', '3'], ['United Kingdom', '3', '0', '0', '0', '3'], ['Belgium', '2', '0', '0', '0', '2'], ['Norway', '0', '2', '0', '0', '2'], ['Colombia', '1', '0', '0', '0', '1'], ['Denmark', '0', '0', '0', '1', '1'], ['Greece', '1', '0', '0', '0', '1'], ['Guatemala', '1', '0', '0', '0', '1'], ['Ireland', '1', '0', '0', '0', '1'], ['Italy', '1', '0', '0', '0', '1'], ['Poland', '0', '1', '0', '0', '1'], ['Sweden', '1', '0', '0', '0', '1']]}