Nikolai has to be in Saint Petersburg for a week. The accommodations are much better than at Vishny-Volochok, but also expensive. In fact, the ruble is not acceptable to the innkeeper. Nikolai has a silver chain with seven links, and the innkeeper agrees to accept silver at the rate of one link per day. He insists on payment for the day every morning, but also, to minimize damage to the silver links, that for the entire stay of one week, no more than one link can be cut. How can Nikolai pay the innkeeper?

小提示：

Nikolai can give some pieces of the chain to the innkeeper and receive some others as change.

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