In a game, Bob goes first, and he has to say a positive integer less than or equal to 16.

Then, Allison must add a positive integer less than or equal to 16 to Bobâ€™s number, at which point Bob must add a positive integer less than or equal to 16, and so on. The winner is whomever says the number **2015**.

What number must Bob say first to ensure that he will win the game if both players play optimally?

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