The king returns
A king has servants. He ordered them to stand in a circle and numbered them from 1 to .
He gave to number 1 a sword and ordered him to kill the one next in number and pass the sword until only one left.
(1 kills 2 and passes to 3 and so on)
how many servants the king need to make the numbered servant to stay last?
Note : can be 1 but not 0
Take as a positive integer.
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