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Assume there are $n$ candies, each candy has a cover, where $2$ candy covers can exchange for a candy. Say if there are 2 candy, then total there will be $2$ candy and $2$ candy cover and in total $3$ candy. Now assume the case when a children has $n$ candy, how many candy can the children get overall? I try to formulate the question but not sure how to get the general formula.

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