How many square decimeters of iron sheet is needed to make an uncovered iron sheet water storage tank with a length of 14 decimeters, a width of 5 decimeters, and a height of 2 decimeters?
做一个长14分米，宽5分米，高2分米的无盖铁皮蓄水槽，最少需要多少平方分米的铁皮？
<gadget id="calculator">14 * 5</gadget>
<output>70</output>

<gadget id="calculator">14 * 2 * 2</gadget>
<output>56</output>

<gadget id="calculator">5 * 2 * 2</gadget>
<output>20</output>

<gadget id="calculator">70 + 56 + 20</gadget>
<output>146</output>

<result>146</result>