Graveyard of 1000 tombs

[pacoface]

I'm trying to answer Rila's riddle. I tried 1000, since that's the name of the graveyard. I counted 80, but that didn't work either. I know it's possible I'm miscounting. Any help?

[D-Squall]

You missed by 1

The right is 81.

[Tigger54]

Succeeded in getting right number, but had difficulty in knowing how to enter it.

Discovered after much frustration, that one needs to use arrow keys on each digit !!!!!
Not sure if anyone else has had the same issue?