Use steel bars to make a cuboid frame with a length of 50 cm, a width of 30 cm, and a height of 20 cm. What is the minimum length of steel bars needed?
用钢条制作一个长50厘米，宽30厘米，高20厘米的长方体框架，至少需要多少厘米长的钢条？
<gadget id="calculator">50 + 30 + 20</gadget>
<output>100</output>

<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<result>400</result>