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def rabbits(n=40, k=1, prev1=1, prev2=0):
now = prev1 + k * prev2
return 1 if n < 2 else now if n == 2 else rabbits(n-1, k, now, prev1)
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t = {i:j for i, j in zip([inp_f.read().splitlines()[::2]],[inp_f.read().splitlines()[1::2]])}