A rope is 180 decimeters long. From one end, make a mark every 3 decimeters, and make a mark every 4 decimeters, and then cut the marked place. How many pieces is this rope cut into?
一根绳子长180分米，从一端开始每隔3分米作一个记号，每隔4分米也作一个记号，然后把标有记号的地方剪断，这根绳子被剪成了多少段？
<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<gadget id="calculator">45 - 1</gadget>
<output>44</output>

<gadget id="calculator">180 / 12</gadget>
<output>15</output>

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

<gadget id="calculator">44 - 14</gadget>
<output>30</output>

<gadget id="calculator">59 + 30</gadget>
<output>89</output>

<gadget id="calculator">89 + 1</gadget>
<output>90</output>

<result>90</result>