Here's the Climber's Jersey(POlka Dot jersey) points system.
Literally, this is another race within the race.
Depending on the steepness of the climb points vary.
"Hors Categorie" is literally straight up the hardest.
Hors Categorie:
20-18-16-14-12-10-8-7-6-5
Category 1:
15-13-11-9-8-7-6-5
Category 2:
10-9-8-7-6-5
Category 3:
4-3-2-1
Category 4:
3-2-1