A piece of iron wire is tied into a rectangular parallelepiped frame with a length of 5 cm, a width of 4 cm, and a height of 3 cm. If this wire is used to form a cube frame, what is the length of the sides of the cube in cm?
一根铁丝扎成了一个长5cm，宽4cm，高3cm的长方体框架，如果用这根铁丝扎成一个正方体框架，这个正方体的棱长是多少cm．
<gadget id="calculator">5 + 4 + 3</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 * (1/3)</gadget>
<output>4</output>

<result>4</result>