How to round up percentage values in a pivot table that add up to 100?

Please forgive me if I don't describe my problem accurately, I've been forced into this and I haven't used excel for many years.

I have several survey responses that I'm trying to make pie charts out of. I have mapped these to a pivot table, I think correctly, and now I'm trying to make pie charts for each question.

What I can't solve for the life of me, is how to perform rounding at the percentage values that adds up to 100. Here is one sample.

"How relevant is this program to your wants and needs?"

(Scale is = 1-Extremely, 5-Not at all)
71,43%
7.14%
14.29%
7.14%
0%

If I format the number to 0 decimals, the percentages add up to 99%. If I try to ROUNDUP the pivot table value cells I get "You cannot edit the formula for a calculated item while custom calculations is used". I don't want to write them by hand because there's several questions.

Accuracy doesn't really matter either. If I can push the highest percentage to fill the rest up to 100, I'm fine with that!

Thank you for any help!

PS: I'm so happy Excel forum still exists! I used it first around 10 years ago, and it's the only website that remembers me every year on my birthday!