Select the N last lines from a "Text File Input".

Hello, I want to select the line number N and N-2 from a text file input (N=rowcount) but I don't know how do it.
For example:


Text File Input:
------------------
Line 01
Line 02
Line 03
Line 04
Line 05




Text File Output:
------------------
Line 03
Line 05


Thanks for all!