The problem can be found here: https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4878
I know the final answer but idk how to get it myself.
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How to solve 12995 — Farey Sequence
The problem can be found here: https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4878
The final answer will be the $$$summation(phi[i]) - 1$$$ for all $$$i$$$ from $$$1$$$ to $$$n$$$ where $$$phi[i]$$$ is the Euler's totient function.
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