Practical Mathematics K10A small community of hackers live on an island. Today, Ardy found a very expensive coin near his house.
He rushed to his neighbor Bardy and bought a second-hand laptop paying with the coin.
Bardy immediately gave the coin to Cardy for two weeks of baby-sitting.
Cardy gave the coin to Dardy for an old-fashioned sofa.
Dardy gave the coin to Ardy for using his wi-fi network.
In the evening, Ardy discovered with a loupe and goggling that the coin is fake and must be destroyed.

Who losеs in the whole transaction?