(GOAL COMPLEXITY)
(STARTTERM (FUNCTIONSYMBOLS f0))
(VAR A B C D)
(RULES
  f0(A,B,C) -> Com_1(f1(0,B,C))
  f1(A,B,C) -> Com_1(f1(A,B - 1,D)) :|: B >= 1 && D >= 1
  f1(A,B,C) -> Com_1(f1(A,B - 2,D)) :|: B >= 1 && 0 >= D
  f1(A,B,C) -> Com_1(f4(A,B,D)) :|: 0 >= B
  f4(A,B,C) -> Com_1(f4(1,B,D)) :|: C >= 1
  f4(A,B,C) -> Com_1(f4(2,B,D)) :|: 0 >= C
)