How to change regular attribute by appending macro and use that attribute for calculation

Hello,

I have the regular attribute name  "atttribute_W" , the W is coming from my macro and append to  atttribute 
next time regular attribute changes to "atttribute_Y" as per my config macro

When I am using this in generate attribute for calculation I getting error "erroneous expression"
Value_%{macro1}                if (Profile=="High",attribute_%{maco1}*100,
                                             if (Profile=="Medium",attribute_%{maco1}*200,
                                             attribute_%{maco1}*300))