Increasing users on wifi

Hey all,

First time poster here. Please be gentle.

I have just moved into an apartment that has free wifi. Problem is, it only allows for 4 people at a time to be connected to it. To access the wifi, you have to use login and pw they provide for each device.

Question is, how can I increase this capability for more users? 5 people in the family, all with laptops, iPods and iPhones. 4 users at a time doesn't cut it. Perhaps setting up an additional router to log into the wifi point and then sharing it out?

Details of the current device are;

Linksys WAP610N

I only see one port. The Internet cable is going into that device, so I'm not sure how I am going to extend its capability.

Best option?

Thanks
Peter