VBA Code for only if cell is blank

Hello,

I'm looking for the a VBA code to allow me to add my formula only if the cells in the range are blank. I'm trying to have different people provide score / rate different questions. The current MACRO inputs the score in to a different spreadsheet and performs a paste special value to make the value hard. The problem is the macro code I have now does the paste special value for all the cells, and I want it to only complete it if cell has a number. The spreadsheet I'm working off attached. Thanks for the help.