In a gathering of friends, everyone shakes hands 28 times when they meet. If everyone at the party shakes hands with everyone else only once, how many people are there in total at the party?
一次朋友聚会，大家见面时总共握手28次，如果参加聚会的每个人和其余的每个人只握手一次，问参加聚会的共有多少人？
<result>8</result>