Identify the Next Number in Sequence - Matchstick Puzzle

Explanation :

 See the matchsticks number carefully, 
the number 8 has 6 joints, 
the alternate number 9 has 5 joints, 
the number 5 has 4 joints, 
3 has 3 joints, 
7 has 2 joints, 
therefore the next number in the line that should have 1 joint which is 1.