Dongdong, Archie and Xiaoyue used a wooden stick to play games. Dongdong first marked the stick with a red pen and divided the stick into 12 equal parts: Archie marked the stick with a blue pen and divided the stick into 12 equal parts. Divide the stick into 20 equal parts: Finally, Xiaoyue marks the stick with a black pen and divides the stick into 30 equal parts. At this time, saw the stick according to the mark, and how many segments are the shortest among the sawn segments.
冬冬、阿奇和小悦用一根木棍做游戏，冬冬先用红笔在木棍上做标记，将木棍12等分：阿奇再用蓝笔在木棍上做标记，将木棍20等分：最后小悦用黑笔在木棍上做标记，将木棍30等分，此时按标记将木棍锯开，那么所锯成的小段中长度最短的共有多少段．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

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

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

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

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

<gadget id="calculator">30 - 1 - 2 - 5 - 14</gadget>
<output>8</output>

<gadget id="calculator">11 + 19 + 8 + 1</gadget>
<output>39</output>

<result>39</result>