Use cardboard to make a cuboid box with a length of 5 decimeters, a width of 35 centimeters, and a height of 3 decimeters. How much cardboard is needed at least?
用硬纸板做一个长方体盒子，长5分米，宽35厘米，高3分米，至少需要多少硬纸板？
<gadget id="calculator">35 / 10</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">5 * (7/2)</gadget>
<output>35/2 = around 17.5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">(7/2) * 3</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">(35/2) + 15 + (21/2)</gadget>
<output>43</output>

<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<result>86</result>