Extended plurals for russian translation do not work

I have added such string to ap-ru_RU.po to have three different strings for my translation for every message:

“Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);\n”

And some messages have three variants:

msgid “1 Answer”
msgid_plural “%d Answer”
msgstr[0] “%d ответ”
msgstr[1] “%d ответа”
msgstr[2] “%d ответов”

But poedit yells me with errors:

POEdit Error:
nplurals = 3…
2 issues with the translation found.

What do I do wrong?