Lay small square cement bricks around a square pool with a side length of 25 meters, each side of which is 50 cm. If three layers of cement bricks are laid close to the edge of the pool to form a three-layer hollow square matrix, how many cement bricks are needed in total?
在边长为25米的正方形水池四周铺设小正方形的水泥砖，这种水泥砖每边为50厘米．如果紧靠水池边铺三层水泥砖，成为三层空心方阵，共需水泥砖多少块？
<gadget id="calculator">100 / 50</gadget>
<output>2</output>

<gadget id="calculator">25 * 2 * 4 * 3</gadget>
<output>600</output>

<gadget id="calculator">3 * 3 * 4</gadget>
<output>36</output>

<gadget id="calculator">600 + 36</gadget>
<output>636</output>

<result>636</result>