MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  fib(0()) -> 0()
     , fib(s(0())) -> s(0())
     , fib(s(s(x))) -> +(fib(s(x)), fib(x))}

Proof Output:    
  The input cannot be shown compatible