From Wiktionary, the free dictionary
пе́рвым • (pérvym) n inan or n inan pl
- inflection of пе́рвое (pérvoje):
- instrumental singular
- dative plural
пе́рвым • (pérvym)
- inflection of пе́рвый (pérvyj, “first, main”):
- instrumental singular
- dative p; instrumental plural