Cisco 1601-R w/ 2 IP blocks?

I have a Cisco 1601-R router. I have a primary static IP block from my
ISP configured in the router. I am currently using all available IP's
in the primary block. My ISP recently assigned me a second set of IP's
for use. Is it possible to configure my router to accept IP addresses
from 2 different IP blocks, or do I need a second router for this?
Thanks. P.S. I'm a cisco newbie.
Telecom, Cabling and VoIP continues...