Euler Operations

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The initial value of $X$ is $0$. You are also given a positive integer $M$. You are allowed to perform the following operation any number of times: - Choose any **positive integer** $K$ less than or equal to $M$. - Either **add** $K$ to $X$ or **subtract** $K$ from $X$. - The cost of this operation is $\varphi(K)$, where $\varphi$ denotes [Euler's Totient function](https://en.wikipedia.org/wiki/E

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solution.cppC++17

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