Coming off of their bye week, the Steelers traveled back home to take on the Saints.  In the first quarter, the Steelers scored when Shaun Suisham nailed a 49-yard field goal for a 3-0 lead for the only score.  They increased their lead when Suisham kicked a 31-yard field goal for a 6-0 game.  The Saints took the lead as Drew Brees found Benjamein Watson on a 15-yard TD pass for a 7-6 game.  This was followed up by Brees finding Eric Long on a 4-yard pass for a 14-6 halftime lead.  After the break, the Saints got back to work as Brees found Nick Toon on an 11-yard TD pass to go ahead 21-6.  The Steelers were able to pull within 8 as Le'Veon Bell ran for a 1-yard TD for a 21-13 game.  The Saints pulled away as Brees found Kenny Stills on a 69-yard TD pass for a 28-13 game.  In the 4th quarter, the Steelers scored another field goal thanks to Suisham kicking it from 47 yards out for a 28-16 game.  However, the Saints pulled away as Brees hooked up with Marques Coltson on a 3-yard TD pass for a 35-16 game.  Ben Roethlisberger would throw his 2 touchdowns of the whole game both to Antonio Brown as time expired from 4 and 3 yards out with successful 2-point conversions tacked on with scores of 35-24 and a final score of 35-32.
Question: How many passing tds were scored?
Answer: 4