You could do the calculations following the ΔΔ Ct (delta delta Ct) method. You don't need a package to do this - one could easily code it. The final inferred copy number would be:
A value of 1 from this would relate to copy number 2, i.e., normal copy number; a value of 0.5 would relate to copy number 1; a value of 2 would relate to copy number 4.
There is a lot of information online about this formula. Just use a search engine to search for that information.