Simple Task

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Geetanjali thinks you are weak in Number Theory. Prove her wrong by solving a simple question asked by her. Given a number $N$, output number of coprimes of $N$ which are greater than 0 and less than $N$. ###Input: - The only line contains an integer $N$. ###Output: Output in a single line the answer to the input. ###Constraints - 1 <= N <= 10^12 ###Subtasks - 30 points : 1 <= N <= 10^6 -

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solution.cppC++17

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