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:
    {  le(0(), y) -> true()
     , le(s(x), 0()) -> false()
     , le(s(x), s(y)) -> le(x, y)
     , minus(0(), y) -> 0()
     , minus(s(x), y) -> if_minus(le(s(x), y), s(x), y)
     , if_minus(true(), s(x), y) -> 0()
     , if_minus(false(), s(x), y) -> s(minus(x, y))
     , gcd(0(), y) -> y
     , gcd(s(x), 0()) -> s(x)
     , gcd(s(x), s(y)) -> if_gcd(le(y, x), s(x), s(y))
     , if_gcd(true(), s(x), s(y)) -> gcd(minus(x, y), s(y))
     , if_gcd(false(), s(x), s(y)) -> gcd(minus(y, x), s(x))}

Proof Output:    
  The input cannot be shown compatible