In ancient India, he fought for many years and lost many wars. The king was puzzled by this matter, and the minister suggested inviting a famous local warlock to relieve his worries. The king was very happy when he met the warlock. He said that there would be a large reward after the victory, but the warlock told the king that I didn't want gold, silver or jewelry, just rice. The king thought the meal was too simple and puzzled, so he readily agreed. The magician told the king. Put four in the third grid, eight in the fourth grid, sixteen in the fifth grid, and so on until the grid is used up. The king thought, this is not simple, but this promise is simple.

As a result, the war was reversed, the warlock returned triumphantly, and the king gave rice as promised, only to find it terrible. If rice is given as promised, the whole granary, including the state treasury, will not be enough? This is the power of multiple increase. ...