One day, a clever old man came to this place and the king invited him to attend. The king promised the old man, "If you win this game, what reward will you get?"
The old man said, "If I win this game, I want a rice board with the first square, two second squares and four third squares, and then I will pay twice as much money every other square."
"Is that all?" Asked the king. Do you prefer gold or silver?
"No, just rice," said the old man.
The king and the old man played games for a long time. Finally, the old man won, so the king ordered his soldiers to collect a bag of rice. He drew the first square, the second square, and so on. The king soon realized the problem. Even if all the rice is in this country, there is still not enough rice to stick to all the squares!