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One thing is there is similar "challenge" already, although in this case number may be large, that's fine. It is EASY, but why would you give solver a hint about using specific type? Isn't it a point of a challange to find out for yourself that you need to use type that can hold large number? By revealing this in note, solving it is pointless. And this plagues many of the challenges here. Why give solver all the necessary hints right away is beyond me.