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_18 (founded INTEGER, stadium VARCHAR, club VARCHAR)
### Question:
What year was the team Club of atlético de san juan fc who plays at hiram bithorn stadium founded.
### Answer:
SELECT SUM(founded) FROM table_name_18 WHERE stadium = "hiram bithorn stadium" AND club = "atlético de san juan fc"