MAYBE

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
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Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  and(true(), X) -> X
     , and(false(), Y) -> false()
     , if(true(), X, Y) -> X
     , if(false(), X, Y) -> Y
     , add(0(), X) -> X
     , add(s(X), Y) -> s(add(X, Y))
     , first(0(), X) -> nil()
     , first(s(X), cons(Y, Z)) -> cons(Y, first(X, Z))
     , from(X) -> cons(X, from(s(X)))}

Proof Output:    
  The input cannot be shown compatible
The following warning(s) occured:

 Warning when parsing problem:
   Unsupported strategy 'OUTERMOST'