# How to add different Q.E.D. symbols to different theorems?

I have a series of theorem styles, two of them look like this:

\theoremstyle{definition}
\newtheorem{define}{Definition}

\theoremstyle{plain}
\newtheorem{theorem}{Theorem}


I want to add a \blacksquare to the end of each definition and a \square to every theorem (that is, in the last line aligned to the right).