certain elementary school held a competition for mathematics, Chinese, and general knowledge. Among the students who participated in at least one subject: 203 students participated in mathematics, 179 students participated in Chinese, and 165 students participated in general knowledge. Participate in two subjects: 143 people in mathematics and Chinese, 116 people in mathematics and general knowledge, 97 people in Chinese and general knowledge, and 89 people who participated in all three subjects. Ask the total number of people participating in the competition in this elementary school?
某小学举行数学、语文、常识三科竞赛，学生中至少参加一科的：数学203人，语文179人，常识165人．参加两科的：数学、语文143人，数学、常识116人，语文、常识97人，三科都参加的：89人．问这个小学参加竞赛的总人数有多少人？
<gadget id="calculator">165 - 143 - 116 - 97</gadget>
<output>-191</output>

<gadget id="calculator">203 + 179 + (-191) + 89</gadget>
<output>280</output>

<result>280</result>