A cubic iron sheet measuring cup without a cover can hold 1 liter of water. What is the minimum square decimeter of iron sheet used to make this measuring cup?
一个无盖的正方体铁皮量杯可装水1升，制成这个量杯至少要用多少平方分米铁皮．
<gadget id="calculator">1 * 1 * 5</gadget>
<output>5</output>

<result>5</result>