rope is cut in half for the first time by more than 2 meters, and the remaining half is cut by 1 meter for the second time, leaving 3 meters. How long is the rope in meters?
一根绳子第一次剪掉一半多2米，第二次剪掉剩下的一半少1米，还剩下3米，这根绳子原来长多少米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>