Once upon a time, a dragon settled next to a large and rich city. The residents wanted to get rid of it at first, but then they managed to come to an agreement with it: the city would give the dragon a pound of gold and three jewels every day, and it would not bother them. The dragon kept it word, so the residents went on paying it. But soon enough, the situation began getting closer to a disaster, and a knight came to the city to slay the dragon. While he was on his way, an old turtle gave him the magical sword able to defeat the beast, but warned him that slaying the dragon was not the most difficult thing. The knight laughed it off, but accepted the sword and did slay the dragon, but as soon as he entered its lair full of treasure, he was so blinded with it that he did not mention that he transformed into a dragon himself. Since then, the residents had to pay even more - two pounds of gold instead of one and ten jewels instead of three, because the new dragon was even greedier than