Two people, A and B, paint on a 3-meter-long wooden stick. First, A starts to blacken 5 cm from the end of the wooden stick, does not paint at intervals of 5 cm, and then paints another 5 cm black, so that it is done alternately to the end. Then, B leaves 6 cm from the same end point of the wooden stick without painting, then paints 6 cm black, and then does not paint at an interval of 6 cm, alternately to the end. Finally, what is the sum of the lengths of the parts of the stick that are not painted black?
甲、乙二人对一根3米长的木棍涂色．首先，甲从木棍端点开始涂黑5厘米，间隔5厘米不涂色，接着再涂黑5厘米，这样交替做到底．然后，乙从木棍同一端点开始留出6厘米不涂色，接着涂黑6厘米，再间隔6厘米不涂色，交替做到底．最后，木棍上没有被涂黑部分的长度总和为多少厘米．
<gadget id="calculator">1 + 3 + 5 + 4 + 2</gadget>
<output>15</output>

<gadget id="calculator">300 / 60</gadget>
<output>5</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>