Cheating in Elder Scrolls V: Skyrim [For PC]; How do I use, " player.addperk <id number> "?

I don't know the id numbers to the perks.Cheating in Elder Scrolls V: Skyrim [For PC]; How do I use, " player.addperk %26lt;id number%26gt; "?
First you must find the "perk id". To do this type:

help "perk name" (rank of perk if needed)

(Note: if the perk is only one word you can leave the quotes out. However, if the perk is more than one word, the quotes are required.