There are two cuboid boxes whose length, width and height are 15 cm, 10 cm and 3 cm respectively. Wrap it in wrapping paper. What is the minimum square centimeter of wrapping paper?
有两个长方体的盒子，长、宽、高分别是15厘米、10厘米、3厘米．用包装纸包装起来．最少需要包装纸多少平方厘米？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">150 + 45 + 30</gadget>
<output>225</output>

<gadget id="calculator">225 * 2 * 2</gadget>
<output>900</output>

<gadget id="calculator">15 * 10 * 2</gadget>
<output>300</output>

<gadget id="calculator">900 - 300</gadget>
<output>600</output>

<result>600</result>