On a strip of paper 60 cm long, 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60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，纸条上共有几个红点？
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">19 + 14</gadget>
<output>33</output>

<gadget id="calculator">33 - 4</gadget>
<output>29</output>

<result>29</result>