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_15 (winner VARCHAR, year VARCHAR, country VARCHAR, score VARCHAR)
  ### Question:
  What is the total number of 1st prize ($) that has a United States country with a score lower than 271 and in a year after 1964 with a winner of Bobby Mitchell?
  ### Answer:
  SELECT COUNT(1 AS st_prize___) AS $__ FROM table_name_15 WHERE country = "united states" AND score < 271 AND year > 1964 AND winner = "bobby mitchell"