According to Slavic folklore, what are vampires obsessed with?

A vampire is a mythical creature that subsists by feeding on the vital essence (generally in the form of blood) of the living. In European folklore, vampires are undead creatures that often visited loved ones and caused mischief or deaths in the neighborhoods which they inhabited while they were alive.

The idea of vampires murdering and/or consuming the living is found in many cultures around the world. Some of these monsters are cleverly cunning while others are mindless killing machines, but the general vampiric themes are shared. Our modern idea of vampires is largely based on the 1897 Bram Stoker novel "Dracula", which in turn took ideas from Romanian folklore.

One curious component of vampire folklore in Slavic down through Greek cultures is the vampire’s obsessive compulsive need to count things. Vampires were said to have arithmomania and needed to count things. People took advantage of this by scattering seeds, salt, grains of rice, or whatever else they had in tiny sizes & large numbers, on the floor of their houses. An intruding vampire would then have to count each seed/grain giving the homeowner time to escape or, if it took the vampire long enough, the sun would rise and vanquish the undead intruder.