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f=lambda n,a=0,b=1:n^a and-~f(n,b,a+b)
 
for n in 0, 2, 3, 5, 8, 13, 1836311903:
	print('%10u -> %2d' % (n, f(n)))

Success #stdin #stdout 0.02s 9984KB

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Standard input is empty

stdout

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         0 ->  0
         2 ->  3
         3 ->  4
         5 ->  5
         8 ->  6
        13 ->  7
1836311903 -> 46

https://ideone.com/fAT2fL

language:

Python 3 (python 3.9.5)

created:

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secret

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