MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  even(0()) -> true()
     , even(s(0())) -> false()
     , even(s(s(x))) -> even(x)
     , half(0()) -> 0()
     , half(s(s(x))) -> s(half(x))
     , plus(0(), y) -> y
     , plus(s(x), y) -> s(plus(x, y))
     , times(0(), y) -> 0()
     , times(s(x), y) -> if_times(even(s(x)), s(x), y)
     , if_times(true(), s(x), y) ->
       plus(times(half(s(x)), y), times(half(s(x)), y))
     , if_times(false(), s(x), y) -> plus(y, times(x, y))}

Proof Output:    
  The input cannot be shown compatible