Are There are four berzerks?

I am the type of person who doesn't buy manga or movies but berzerk has such a great story and artwork so I bought my first manga at the closest comic book store. Strange thing was that when I asked for berzerk the guy said there was four "berzerks" By Miura. When I asked he said there were three and and a fourth that went way off ( like universe). Is this guy bullshitting me? Just want to confirm with you guys.