How many square centimeters of iron sheet is needed to weld a cuboid bucket without a lid whose bottom surface is 25 centimeters long and 40 centimeters high?
用铁皮焊一只底面边长都是25厘米，高40厘米的长方体无盖水桶，至少需要铁皮多少平方厘米？
<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<gadget id="calculator">25 * 40 * 4</gadget>
<output>4_000</output>

<gadget id="calculator">625 + 4_000</gadget>
<output>4_625</output>

<result>4_625</result>