Stas plays a very hard game, called I wanna be the professor. It is similar to I wanna be the Guy, but it is also needed to solve mathematical problems to advance. Once he reached the boss, and now he must calculate the Fast-growing hierarchy to beat the boss.
INPUT
n, a
OUTPUT
Print f — the answer
Example
INPUT
0 1
OUTPUT
2








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What do you wanna express by writing this post
Big numbers