28 people participated in the track and field competition, each participated in at least 2 events, 8 people did not participate in the running event, and 17 people participated in throwing and running and jumping at the same time. How many people participated in running and throwing?
28人参加田径比赛，每人至少参加2项，8人没有参加跑的项目，投掷与同时参加跑和跳的都是17人，参加跑和投掷的有多少人？
<gadget id="calculator">28 - 8</gadget>
<output>20</output>

<gadget id="calculator">20 - 17</gadget>
<output>3</output>

<result>3</result>