How many bots can this VPS run?

Here are the specs:

5. Ultra Package + FREE Setup -
CPU: 4.0 GHz
RAM: 3072 MB Guaranteed
BURST RAM: 4096
Diskspace: 30 GB
Bandwidth: 1000 GB/month 100Mbps
Number of IPs: 2

From this site: http://www.rsbotvps.com/

I would like to know how many bots I can run 24/7. If I had to guess I would say three or four.

Please have experiences using a VPS when answering. Explain to me the basics of setting a server up. What do the number of IPs have to do with this? Do I pick which IPs I want certain bots to run on?

Thanks.