The figure shows a closed Gaussian surface in the shape of a cube of edge length 2.00 m, with one corner at x1 = 5.00 m, y1 = 4.00m. The cube lies in a region where the electric field vector is given by E = -3.00i - 4.00y^2j + 3.00k N/C, with y in meters. What is the net charge contained by the cube?