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:
    {  +(x, 0()) -> x
     , +(0(), x) -> x
     , +(s(x), s(y)) -> s(s(+(x, y)))
     , *(x, 0()) -> 0()
     , *(0(), x) -> 0()
     , *(s(x), s(y)) -> s(+(*(x, y), +(x, y)))
     , sum(nil()) -> 0()
     , sum(cons(x, l)) -> +(x, sum(l))
     , prod(nil()) -> s(0())
     , prod(cons(x, l)) -> *(x, prod(l))}

Proof Output:    
  The input cannot be shown compatible