CREATE TABLE table_24132083_1 (original_air_date VARCHAR(255), directed_by VARCHAR(255), written_by VARCHAR(255))
On how many different dates did the episode directed by Marcos Siega and written by Scott Buck air for the first time?
    
SQL: SELECT COUNT(original_air_date) FROM table_24132083_1 WHERE directed_by = "Marcos Siega" AND written_by = "Scott Buck"