If f(x, y, z) = x² y + y² z + z² x for all (x, y, z) ϵ R³ and \(\nabla = \frac{\partial }{{\partial x}}i + \frac{\partial }{{\partial y}}j + \frac{\partial }{{\partial z}}k\), then the value of ∇.(∇ × ∇ f) + ∇.(∇ f) at (1, 1, 1) is