CREATE TABLE table_24132083_1 (original_air_date VARCHAR2, directed_by VARCHAR2, written_by VARCHAR2)

On how many different dates did the episode directed by Marcos Siega and written by Scott Buck air for the first time?
SELECT COUNT(original_air_date) FROM table_24132083_1 WHERE directed_by = "Marcos Siega" AND written_by = "Scott Buck"
SELECT COUNT("original_air_date") FROM "table_24132083_1" WHERE "Marcos Siega" = "directed_by" AND "Scott Buck" = "written_by"