strange plant has been cultivated in the laboratory. It grows very rapidly, and every day it will grow to three times the mass of yesterday, which is more than 4 kg. After cultivating for 3 days, the mass of the plant reaches 133 kilograms. How many kilograms does this plant originally weigh?
实验室中培养了一种奇特的植物，它生长得非常迅速，每天都会生长到昨天的质量的3倍还多4千克．培养了3天后，植物的质量达到133千克，这株植物原来有多少千克．
<gadget id="calculator">3 * 3 * 4</gadget>
<output>36</output>

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

<gadget id="calculator">133 - 36 - 12 - 4</gadget>
<output>81</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">81 / 27</gadget>
<output>3</output>

<result>3</result>