[R] arima additive seasonality

[Martin Ivanov]

Hello!
I asked in this forum about what kind of seasonality the function arima() from stats implements. Now that I have been answered that it implements the Box-Jenkins multiplicative seasonality, I would like to ask whether there is in R possibility to model ARIMA with additive seasonality. I mean whether there is a function or package that implements additive seasonality. In case there is no such function, I would be thankful if someone suggests some code for the purpose. 

Thank you very much for your attention.

Regards,
Martin