How can I change the font size of headings using mwcls?

I use `\documentclass mwrep`.
I want to change:
`chapter` to have font size 14pt bold
`section` to have font size 13pt bold
`subsection` to have font size 12pt bold italic

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My Polish isn't very good, (in fact non-existent) but from the documentation of `mwrep` I was able to figure out the following:

``````\SetSectionFormatting{section} {24pt plus5pt minus2pt}
Check MWCLS Podręcznik użytkownika (`texdoc mwcls`). There are `\SetSectionFormatting`, `\FormatChapterHeading` and similar macros for defining look of chapter, section or subsection headers. You can use there e.g. `\fontsize{14}{17}\selectfont` for 14pt, etc.