Well if you don't know, then obviously you don't know very much about ball pythons.
You should NEVER EVER house ball pythons together unless they are breeding. Which surely yours are not. Ball pythons are solitary animals and become extremely stressed when housed with other ball pythons. Also, if one gets sick, all 4 get sick. If one has mites, they all have mites. Then you have to pay for 4 sick snakes as opposed to just one.
Taken from the ball python FAQ:
It is possible to do so, yes. But it is NOT a recommended practice. Snakes are not social creatures and it is stressful for them to live together. What may appear to be 'cuddling' is in fact the snakes competing for the best parts of the cage. Aside from the stress factor, snakes living in the same enclosure are free to share parasites and diseases with each other. This also makes it more difficult to figure out which one is sick if you notice abnormal stool, for instance.
What possessed you to put them all together?