If you put a bacterium in a sealed bottle, the bottle will be full of bacteria after 2 minutes. It is known that each bacterium divides into 2 per second, 4 in 2 seconds, and 8 in 3 seconds... If you put 2 bacteria in the beginning, how long will it take to make the bottle full of bacteria?
密封的瓶中，如果放进一个细菌，2分钟后瓶中就充满了细菌．已知每个细菌每秒分裂成2个，两秒就分裂成4个，三秒就分裂成8个…如果开始时放进两个细菌，要使瓶中充满细菌，需要多长时间？
<gadget id="calculator">2 * 60</gadget>
<output>120</output>

<gadget id="calculator">120 - 1</gadget>
<output>119</output>

<result>119</result>