MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  f(0(x1)) -> s(0(x1))
     , d(0(x1)) -> 0(x1)
     , d(s(x1)) -> s(s(d(p(s(x1)))))
     , f(s(x1)) -> d(f(p(s(x1))))
     , p(s(x1)) -> x1}

Proof Output:    
  The input cannot be shown compatible