On a piece of paper with a length of 36 cm, draw a red dot every 3 cm from the left end, and then draw a red dot every 4 cm from the left end. Both endpoints of the strip are not drawn. Finally, how many red dots are there on the note?
在一张长36厘米的纸条上，从左端起，先每隔3厘米画一个红点，再从左端起，每隔4厘米画一个红点．纸条的两个端点都不画．最后，纸条上共有多少个红点？
<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">11 + 8</gadget>
<output>19</output>

<gadget id="calculator">19 - 2</gadget>
<output>17</output>

<result>17</result>