Three Peasants, Eight Naan Breads

Two peasants, hungry on the way, decided to stop to eat. One had 5 naan breads with him, the other had 3. As soon as they were about to eat, a third peasant who had no food at all came up and asked them for permission to participate in the meal, promising to pay. They agreed. When all the naan breads were equally divided and eaten, the guest paid 8 rupees and left. How should the two peasants fairly share the money received?