Xiaoqiang measured the vertical air conditioner in his house. The length is 0.5 meters, the width is 0.4 meters, and the height is 1.7 meters. Xiaoqiang’s mother is going to make a cloth cover for the air conditioner. Please help Xiaoqiang’s mother calculate how many square meters of fabric is needed.
小强测量了一下他家的立式空调，长0.5米宽0.4米高1.7米小强的妈妈准备给空调做个布罩，请你帮小强的妈妈算一算至少需要多少平方米的布料．
<gadget id="calculator">0.5 * 0.4</gadget>
<output>0.2</output>

<gadget id="calculator">0.5 * 1.7 * 2</gadget>
<output>1.7</output>

<gadget id="calculator">0.4 * 1.7 * 2</gadget>
<output>1.36</output>

<gadget id="calculator">0.2 + 1.7 + 1.36</gadget>
<output>3.26</output>

<result>3.26</result>