There are 15 red dots in the plane, and some line segments are connected between these red dots. A red dot connects several line segments, and a number is marked on this red dot. It is known that all the red dots marked with the same number are not connected to each other, so how many line segments are connected between these 15 red dots at most.
平面中有15个红点，在这些红点间连一些线段，一个红点连出了几条线段，就在这个红点上标几．已知所有标有相同数的红点之间互不连线，那么这15个红点间最多连了多少条线段．
<gadget id="calculator">1 * 14</gadget>
<output>14</output>

<gadget id="calculator">2 * 13</gadget>
<output>26</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">4 * 11</gadget>
<output>44</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">14 + 26 + 36 + 44 + 50</gadget>
<output>170</output>

<gadget id="calculator">170 / 2</gadget>
<output>85</output>

<result>85</result>