камней

камней

"Камней" means "of stones" or "stones' (genitive plural form)."

Here, 'камней' is in the genitive plural form, used to indicate that the object, 'stones,' is involved quantitatively with the number five.

Мне нужно найти пять гладких камней для своей коллекции.

I need to find five smooth stones for my collection.

In this example, 'камней' is in the genitive plural, used as a possessive form describing what the bag is full of, 'stones.'

Мы подняли сумку, полную камней, с земли.

We lifted a bag full of stones from the ground.

Here, 'камней' is in the genitive plural form, used to denote the material composition of the heap that fell down during the event.

Во время обвала упала куча камней.

During the landslide, a pile of stones fell.