What value do I enter in additional tax on early distribution section if my distribution was already taxed by both state/fed; full amount from 1099-R, or minus both tax?

in this section of the state filing, I selected My Distributions Are Not Subject to Additional Tax, with exception number 9-first home purchase as I used the money to pay supplemental property taxes from my first time buy in 2019, but the assessed taxes weren't due & paid till 2020. Should I enter the full gross value marked in box 1 of my 1099-R, or minus both fed/state taxes & enter that value I believe shouldn't be subject to more taxes?