HUIZINGA'S PROFILE

Alright guys, i'm trying to realize a way of doing a perk system, just like in skyrim. For the ones that don't know what the system is, it's very simple: every time you gain a level, you gain a perk that you can aplly to your character in any skill that you choose. I haven´t tried to create the system yet, but I've been messing with the program right now and I can´t figure out a way of doing it. Initially I thought it would be possible just crating a common event with a conditional branch that adds a point to a variable (wich is the perk number) every time the hero gains a level. The problem is that there's no such condition, only the "hero level is at least", wich i'm not sure would work. Am i wrong? Any ideais? Thanks, and sorry for my bad english, 'im from Brasil.