CREATE TABLE table_name_18 (founded INTEGER, stadium VARCHAR, club VARCHAR)
SELECT SUM(founded) FROM table_name_18 WHERE stadium = "hiram bithorn stadium" AND club = "atlético de san juan fc"
ก่อตั้งทีม Club of atlético de san juan fc ซึ่งเล่นที่สนามกีฬา hiram bithorn ในปีใด
What year was the team Club of atlético de san juan fc who plays at hiram bithorn stadium founded.