[NTG-context] Change counter of chapters (sections, subsections...)

Hello ConTeXistI need to start writing any text from 53 page and such from the 5th chapter (or section). It is possible in a similar way as I set the start page number set also the counter of chapters (sections)? Here is my minimal example: \starttext \chapter{Fictive chapter} \chapter{Fictive chapter} \chapter{Fictive chapter} \chapter{Fictive chapter} \page \setcounter[userpage][53] \chapter{Fifth (actually first) nonfictive chapter} blablabla \stoptext Thanx for help. Jaroslav Hajtmar