Teacher Wang is going to prepare a flag-raising rope for the school flagpole. At the same time, he measured that the shadow length of a meter stick is 0.8 meters, and the shadow length of the flagpole is 12 meters. If the flag-raising rope is 1 meter above the ground, Teacher Wang should at least How many meters to buy a flag rope?
王老师准备为学校旗杆配制一根升旗绳，在同一时间里，他测得一根米尺的影长0.8米，旗杆的影长为12米，如果升旗绳距地面1米，王老师至少应买升旗绳多少米？
<gadget id="calculator">1 / 0.8</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 * 12</gadget>
<output>15</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>