CREATE TABLE table_12995531_3 (total_viewers INTEGER, date_of_first_broadcast VARCHAR(255), episode_number VARCHAR(255))
what is the total viewers where the date of first broadcast is 28 january 2010 and the episode number is 1?
    
SQL: SELECT MIN(total_viewers) FROM table_12995531_3 WHERE date_of_first_broadcast = "28 January 2010" AND episode_number = 1