supermarket wants to make a glass counter with a length of 2.3m, a width of 50cm, and a height of 1.2m. Now it is necessary to install angle irons on all sides of the counter. How many meters of angle irons are needed for this counter?
某超市，要做一个长2.3m，宽50cm，高1.2m的玻璃柜台，现要在柜台各边都安上角铁，这个柜台需要多少米角铁．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2.3 + (1/2) + 1.2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>