How to write a formula to import data into Google Spreadsheet?

Question

Google Sheets

Site https://mangalib.org/i-alone-level-up
Formula that does not work in this site =REGEXEXTRACT(INDEX(IMPORTHTML(INDIRECT("R[-1]C";0);"table";0) ;2;1);"\d+\s*(?:-\s*)?(\S+)")
Site where she works
https://readmanga.live/magiia_vernuvshegosia_doljn...
I need to import the number 121 from the first site.
Pliz just not difficult!