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100 People in a Circle

100 people standing in a circle in an order 1 to 100.

No.1 has a sword.
He kills next person (i.e. no. 2) and gives sword to next to next (i.e no.3).
All person does the same until only 1 survives.

Which number survives at the last?

Answer is a integer. Just put the number without any decimal places if its an integer. If the answer is Infinity, output Infinity.

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