There is a glass counter with a length of 2.6m, a width of 50cm, and a height of 90cm in the canteen. Due to the store decoration, angle irons are installed on all sides of the shelf. How many meters of angle irons does this counter need?
小卖部里有一个长2.6m，宽50cm，高90cm的玻璃柜台，因店面装修，现在把这个货架的各边都安上角铁，这个柜台需要多少m的角铁？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">2.6 + (1/2) + (9/10)</gadget>
<output>4</output>

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

<result>16</result>