Copy/paste button code work wrong

Hello,

I would like to ask some1 for help.
As you can see in the attached file I made a button to copy values from E column to A. But i need to make some changes to not copy the N/A values. I am inserting numbers to the column A (from 50-100) and i need edit them by the small formula in E column. I made the button because is necessary copy them several times, but i need make the code to recognize if there is a number or N/A so it will paste only the numbers and keep other cells blank. So the chart wont get deformed by the zeros... .