text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_72 (bronze INTEGER, nation VARCHAR, silver VARCHAR)
  ### Question:
  What is the number of bronze for Canada and silver is less than 0?
  ### Answer:
  SELECT SUM(bronze) FROM table_name_72 WHERE nation = "canada" AND silver < 0