- \addcontentsline{toc}{section}{Problem #1}%
- \newtheorem*{Pr@blem\Pr@blemCounter}{Problem #1}%
- \begin{Pr@blem\Pr@blemCounter}%
+ \addcontentsline{toc}{subsection}{Problem #1}%
+ \addtocounter{XPr@blem}{1}% <- increment XPr@blem
+ \expandafter\newtheorem*{XPr@blem\arabic{XPr@blem}}{Problem #1}%
+ \expandafter\begin{XPr@blem\arabic{XPr@blem}}%