YES(?, 42*a + 23)

Initial complexity problem:
1:	T:
		(1, 1)    evalfstart(a, b, c) -> evalfentryin(a, b, c)
		(?, 1)    evalfentryin(a, b, c) -> evalfbb3in(b, a, 0) [ a >= 1 /\ b >= 1 ]
		(?, 1)    evalfbb3in(a, b, c) -> evalfreturnin(a, b, c) [ 0 >= b ]
		(?, 1)    evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ b >= 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ 0 >= d + 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ d >= 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfreturnin(a, b, c)
		(?, 1)    evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ a >= c + 1 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= a ]
		(?, 1)    evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1)
		(?, 1)    evalfreturnin(a, b, c) -> evalfstop(a, b, c)
	start location:	evalfstart
	leaf cost:	0

Repeatedly removing leaves of the complexity graph in problem 1 produces the following problem:
2:	T:
		(1, 1)    evalfstart(a, b, c) -> evalfentryin(a, b, c)
		(?, 1)    evalfentryin(a, b, c) -> evalfbb3in(b, a, 0) [ a >= 1 /\ b >= 1 ]
		(?, 1)    evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ b >= 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ 0 >= d + 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ d >= 1 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ a >= c + 1 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= a ]
		(?, 1)    evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1)
	start location:	evalfstart
	leaf cost:	3

Repeatedly propagating knowledge in problem 2 produces the following problem:
3:	T:
		(1, 1)    evalfstart(a, b, c) -> evalfentryin(a, b, c)
		(1, 1)    evalfentryin(a, b, c) -> evalfbb3in(b, a, 0) [ a >= 1 /\ b >= 1 ]
		(?, 1)    evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ b >= 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ 0 >= d + 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ d >= 1 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ a >= c + 1 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= a ]
		(?, 1)    evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1)
	start location:	evalfstart
	leaf cost:	3

Applied AI with 'oct' on problem 3 to obtain the following invariants:
  For symbol evalfbb1in: X_1 - X_3 - 1 >= 0 /\ X_3 >= 0 /\ X_2 + X_3 - 1 >= 0 /\ X_1 + X_3 - 1 >= 0 /\ X_2 - 1 >= 0 /\ X_1 + X_2 - 2 >= 0 /\ X_1 - 1 >= 0
  For symbol evalfbb3in: X_3 >= 0 /\ X_2 + X_3 - 1 >= 0 /\ X_1 + X_3 - 1 >= 0 /\ X_1 - 1 >= 0
  For symbol evalfbb4in: X_3 >= 0 /\ X_2 + X_3 - 1 >= 0 /\ X_1 + X_3 - 1 >= 0 /\ X_2 - 1 >= 0 /\ X_1 + X_2 - 2 >= 0 /\ X_1 - 1 >= 0
  For symbol evalfbbin: X_3 >= 0 /\ X_2 + X_3 - 1 >= 0 /\ X_1 + X_3 - 1 >= 0 /\ X_2 - 1 >= 0 /\ X_1 + X_2 - 2 >= 0 /\ X_1 - 1 >= 0


This yielded the following problem:
4:	T:
		(?, 1)    evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1) [ a - c - 1 >= 0 /\ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ c >= a ]
		(?, 1)    evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ a >= c + 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ d >= 1 ]
		(?, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ 0 >= d + 1 ]
		(?, 1)    evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ a - 1 >= 0 /\ b >= 1 ]
		(1, 1)    evalfentryin(a, b, c) -> evalfbb3in(b, a, 0) [ a >= 1 /\ b >= 1 ]
		(1, 1)    evalfstart(a, b, c) -> evalfentryin(a, b, c)
	start location:	evalfstart
	leaf cost:	3

A polynomial rank function with
	Pol(evalfbb1in) = 7*V_2 + 3*V_3 - 6
	Pol(evalfbb3in) = 7*V_2 + 3*V_3 - 3
	Pol(evalfbbin) = 7*V_2 + 3*V_3 - 5
	Pol(evalfbb4in) = 7*V_2 + 3*V_3 - 4
	Pol(evalfentryin) = 7*V_1 - 3
	Pol(evalfstart) = 7*V_1 - 3
orients all transitions weakly and the transitions
	evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ c >= a ]
	evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ a >= c + 1 ]
	evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ d >= 1 ]
	evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ 0 >= d + 1 ]
	evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ a - 1 >= 0 /\ b >= 1 ]
	evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1) [ a - c - 1 >= 0 /\ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 ]
strictly and produces the following problem:
5:	T:
		(7*a + 3, 1)    evalfbb1in(a, b, c) -> evalfbb3in(a, b - 1, c + 1) [ a - c - 1 >= 0 /\ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 ]
		(7*a + 3, 1)    evalfbbin(a, b, c) -> evalfbb3in(a, b, 0) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ c >= a ]
		(7*a + 3, 1)    evalfbbin(a, b, c) -> evalfbb1in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ a >= c + 1 ]
		(7*a + 3, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ d >= 1 ]
		(7*a + 3, 1)    evalfbb4in(a, b, c) -> evalfbbin(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ b - 1 >= 0 /\ a + b - 2 >= 0 /\ a - 1 >= 0 /\ 0 >= d + 1 ]
		(7*a + 3, 1)    evalfbb3in(a, b, c) -> evalfbb4in(a, b, c) [ c >= 0 /\ b + c - 1 >= 0 /\ a + c - 1 >= 0 /\ a - 1 >= 0 /\ b >= 1 ]
		(1, 1)          evalfentryin(a, b, c) -> evalfbb3in(b, a, 0) [ a >= 1 /\ b >= 1 ]
		(1, 1)          evalfstart(a, b, c) -> evalfentryin(a, b, c)
	start location:	evalfstart
	leaf cost:	3

Complexity upper bound 42*a + 23

Time: 0.415 sec (SMT: 0.391 sec)