Splited ISO, how to regenerate full ISO.

Hi to everyone this is my first post.
I wanted to try a new distro so I downloaded the 3.4 version of Sabayon from http://sabayon.openfish.info/mirror/, there you could download the iso but splitted into three parts. The thing is that now that I have those parts already in my machine I am not able to generate the full iso. Could anybody help me?
I wanted to try a new distro so I downloaded the 3.4 version of Sabayon from http://sabayon.openfish.info/mirror/, there you could download the iso but splitted into three parts. The thing is that now that I have those parts already in my machine I am not able to generate the full iso. Could anybody help me?