Queue program: n soldiers were numbered 1,2,3, ..., n, each time stand n soldiers Executive is required from the head to the tail followed by numbered rows 1,2,3 ..., n soldiers . If you order in chaos, sir very unhappy consequences will be very serious. Once the order by number of soldiers just stand a good team, suddenly Executive ordered that all the soldiers immediately take the kettle back to the dorm, going to perform a temporary task, due to the time constraints, panic soldiers came back to get the kettle, and some could not stand to they should stop position. Executive unhappy, then ordered the soldiers to swap positions through twenty-two method according to the original order stand, and states: every exchange position, only the first row of the first row and the addition of either a foreign exchange position of the person. Now tell your soldiers in formation, and asked how many times the minimum exchange can be restored to 1,2,3,. . . , N for the order.

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