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This is an ancient math title. You have a string of seven rings. It uses it as you live in a hotel. You have to pay every day, but you can't give him a necklace. You have to live for six days, then take this necklace, the hotel offers demolition, but the cost of each ring is this ring. How to disassemble and pay these six days. From the third ring, it is 2, 1, 4 to hand over the ring to her. The first day will give him the next day to the next day, which one will return to her on the third day. And two on the fourth day of giving him four days to give him a sixth day to give him a sixth day.
