The school has a teaching building in the shape of a cuboid, 40 meters long, 30 meters wide, and 25 meters high. Now it is going to buy colored light wires to decorate the 8 edges outside the ground of the teaching building. The school should buy at least how many colored light wires.
学校有一栋长方体形状的教学楼，长40米，宽30米，高25米，现准备买彩灯线装饰教学楼的地面外的8条棱，学校至少应该买多少的彩灯线．
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">80 + 60 + 100</gadget>
<output>240</output>

<result>240</result>