divergence theorem

For F = xyzi+ xy2 zj - xy2 z k, find V . F. V . F = Hence, evaluate y V . F dV, where V is the region bounded by the planes x = 0, x = 1, y = 0, y = 3, z = 0, Z = 4. By using the divergence theorem, or otherwise, evaluate , F . dS over the surface of this volume