There is a game very popular in *ZJU* at present, *Bob* didn't meant to participate in it. But he decided to join it after discovering a lot of pretty girls playing it.

There are `n` stones on the ground and they are marked as *1*
to `n` respectively. There will be 2 players in each competition. And
the game rules are simple, A and B take turns to move. Each round, one of them
can only take 1 number away, and then pick out all the divisors of the choosed
number. When anyone who can not take away 1 number any longer, he will fail the whole game.

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