On Xiao Ming’s birthday, the friends who came first shook hands with each other, and Xiao Gang only shook hands with the neighbors when he came late. They shook hands 61 times in total, so the person who shook hands with Xiao Gang How many people are there?
小明过生日时，先来的朋友每两人之间都互相握一次手，小刚来晚了只和邻近的人之间握了手，他们一共握了61次手，那么和小刚握手的有几个人呢？
<gadget id="calculator">12 * 11</gadget>
<output>132</output>

<gadget id="calculator">132 / 2</gadget>
<output>66</output>

<gadget id="calculator">66 - 61</gadget>
<output>5</output>

<result>5</result>