Paint a thin circle of black paint every 8 cm on a wooden stick, and paint both ends of the wooden stick with black paint. Paint a total of 8 times. How long is the wooden stick in centimeters?
在一根木棒上每隔8厘米的地方用黑漆涂一细圈，木棒两端也要用黑漆涂上，一共涂了8次，这根木棒长多少厘米．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<result>56</result>