Luv Kush and FX Sequence

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Luv & Kush were very intelligent twin children of Lord Rama and Sita Mata. One day, Luv interestingly formed a sequence, named $FX$ ($FibXor$) $Sequence$. He was curious to find the $n$$th$ term of the sequence. So, instead of finding it himself and to test the intelligence of his brother, Kush, he asked Kush to find the $n$$th$ term. But, since Kush is busy learning "Dhanur Vidhya", so, you have

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solution.cppC++17

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