People who attend the party shake hands once to say hello, if each person shakes hands with other people only once, and there are 136 handshakes in total, how many people attend the party?
参加联欢会的人见面都握一次手问好，若每人与其他人只握一次手，共要握手136次，则共有多少人参加联欢会．
<result>17</result>