100 people standing in a circle in an order 1 to 100. No.1 has a sword

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?

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