At the June 1st Gala, every student performing a show should shake hands with each other once. The students shook hands 36 times in total. How many people are performing.
六一节联欢晚会上，表演节目的每一位同学都要互相握手一次，同学们共握手36次，表演节目的共有多少人．
<result>9</result>