Students from class 6 and 1 took graduation photos. In order to prevent each student from being blocked by the people in front, starting from the second row, each row had to stand one more person than the previous row. It is known that there are 8 people standing in the first row, and a total of 4 rows are full. How many students participated in the photoshoot?
六1班同学拍毕业照，为了使每个学生都不被前面的人挡住，从第二排起，每排都要比前一排多站1人．已知第一排站了8人，共站满了4排．参加拍照的同学共有多少人？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">8 + 8 + 3</gadget>
<output>19</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<result>38</result>