Despite leading 17-15 at halftime, the Lions only managed to score 2 more points the rest of the game on an intentional safety taken by the Vikings in the closing seconds, losing 28-19 and dropping to 1-6. Quarterback Matthew Stafford was hit 13 times and sacked 7 times. The next day, the Lions fired offensive coordinator Joe Lombardi, offensive line coach Jeremiah Washburn and assistant offensive line coach Terry Heffernan. Quarterbacks coach Jim Bob Cooter will take over as offensive coordinator, tight ends coach Ron Prince takes over for Washburn, and special teams assistant Devin Fitzsimmons takes over as the new tight ends coach.

Based on the above article, answer a question. How many people did the Lions fire the day after the game?
3