certain building is 60 meters long, 50 meters wide, and 70 meters high. When "May 1st" arrives, in order to add to the festive atmosphere, the worker uncle will install colored lights around the building (the four sides of the bottom are not installed). Uncle Zhang went to the store to buy bundles of 100-meter-long lantern wires. How many bundles of these lantern wires should he buy at least?
某建筑物长60米、宽50米、高70米，"五、一"到了，为了增添节日气氛，工人叔叔要在这个建筑物四周装上彩灯(底面的四边不装)．张叔叔去商店买了每捆长100米的彩灯线，他至少要买几捆这样的彩灯线？
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">70 * 4</gadget>
<output>280</output>

<gadget id="calculator">120 + 100 + 280</gadget>
<output>500</output>

<gadget id="calculator">500 / 100</gadget>
<output>5</output>

<result>5</result>