Path dependency of template

I created a template (myclass.cls), which includes another file (mystyle.sty) using the input command. Then I used the template in a document (mydocument.tex). The directories are as follow:

mypath/myclass.cls
mypath/mystyle.sty
mypath/project/mydocument.tex

The template file

newcommand{classname}{myclass}
providecommand{baseclass}{article}
LoadClass{baseclass}
NeedsTeXFormat{LaTeX2e}
ProvidesClass{classname}

input{mystyle.sty}

...

endinput

The document file

documentclass{../myclass}

begin{document}

...

end{document}

The document file will not compile because, while mystyle.sty exists relative to myclass.cls, it does not exist relative to project/mydocument.tex, such that when I compile project/mydocument.tex, I receive the error that mystyle.sty cannot be found.

I have seen solutions like defining some path variables, but I am inquiring the possibility of making the path of mystyle.sty relative to myclass.cls (the location of the template) not document.tex (the location of the file that uses the template).