MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  perfectp(0()) -> false()
     , perfectp(s(x)) -> f(x, s(0()), s(x), s(x))
     , f(0(), y, 0(), u) -> true()
     , f(0(), y, s(z), u) -> false()
     , f(s(x), 0(), z, u) -> f(x, u, minus(z, s(x)), u)
     , f(s(x), s(y), z, u) ->
       if(le(x, y), f(s(x), minus(y, x), z, u), f(x, u, z, u))}

Proof Output:    
  The input cannot be shown compatible