在一个生死攸关的游戏里，作为一艘帆船的船长，在被海盗俘虏后必须选择一个数字N来决定船员们走跳板的顺序。游戏规则为：从船长开始数，每数到N的人将被迫走跳板，直到剩下最后一人，该人将获得自由。
You are the captain of a sailing vessel and you and your crew have been captured by pirates. The pirate captain has all of you standing in a circle on the deck of his ship trying to decide in which order you should walk the plank. Eventually he decides on the following method:
(a) The pirate captain asks you to pick a number N.
(b) The first person to walk the plank will be the Nth person
(starting from you).
(c) The captain will then continue around the circle forcing every Nth
person to walk the plank.
(d) Once there is only one person left, that person will be given
freedom.
For example: The crew consists of: Andrew, Brenda, Craig, Deidre,
Edward, Felicity, Greg and Harriet. Andrew selects N=2. The crew will
walk the plank in the order: Brenda, Deidre, Felicity, Harriet, Craig,
Greg, Edward. Andrew will be given freedom.
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