Grab URL value...

[eluser]woomacoder[/eluser]
Hello,

I have a problem; I wanna grab a single part of url, for example:

domain.com/index.php/controller-name/apple-iphone-3g-16gb-black-1

I wanna read in my controller-name, the 1 (ID) of url..., the latest item.
But... i'dont now

Sorry for my english.
Thank you"