Round odd numbers for conditional formatting

I have a sheet that has conditional formatting that looks at column D2
for a number and divides that by half. it then colors in a corresponding cell on a row in the sheet that matches that number. the problem i am having is with odd numbers like 23 it gives a result of 11.5 . all my cell numbers are all rounded to whole numbers. i need to round the 11.5 to 12 or 13 it does not matter which one... i just need it to round it up or down. I have tried everything i can think of but have had no luck. I attached my workbook so you can see how it works.