Round table

I came up with a puzzle.
You attack neutral creatures - 1 Azure Dragon - with a hero whose army consists only of peasants, but has no spellbooks, siege weapons, or artifacts.
Question: with what minimum number of peasants can you defeat the Azure Dragon?

Tazar, max level, with max defense and attack. So that the dragon kills as few as possible. Ideally, 1 peasant. We always attack with luck and morale.

The damage of peasants with max attack will be 400% + luck and morale and offense, which is, roughly, 1000%.
The dragon will kill one at a time. This means that the sum of the arithmetic progression (with a step of minus 1) must be equal to 1000. Damn, I don't have time to think, I'm going fishing)
approximately 15 people).