A cantilevered bar is 500 mm long with square cross section (25mm x 25 mm). Three perpendicular forces are applied to its free end. A 1000 N force is applied in the beam length (x) direction, a 100 N force is applied in the y direction, and a force of 100 N is applied in the z direction. Calculate the Von-Mises stress at the clamped end of the bar.