Elizabeth made taxable gifts of $6,850,000 in 2021 and $8,905,000 in 2023. She paid no gift tax on the 2021 transfer. On what amount is the Federal gift tax computed for the 2023 gift?

Elizabeth made taxable gifts of $6,850,000 in 2021 and $8,905,000 in 2023 . She paid no gift tax on the 2021 transfer. On what amount is the Federal gift tax computed for the 2023 gift