Surface Integrals, Stokes & Divergence · Easy problem

Let $C$ be the boundary of the rectangle $0 \le x \le 1$, $0 \le y \le 2$ in the plane $z = 3$, oriented counterclockwise when viewed from above. Use Stokes' theorem to find $\oint_C \mathbf F\cdot d\mathbf r$ for $\mathbf F = (-yz,\ x,\ 0)$.