The number of people participating in the interest groups outside the school in Hope Primary School is 52 more this semester than the previous semester, and the number of this semester is 1 person more than four times that of the previous semester. How many people participate in off-campus interest groups this semester?
希望小学参加校外兴趣小组的人数，本学期比上学期多52人，本学期人数是上学期的4倍多1人．本学期有多少人参加校外兴趣小组？
<gadget id="calculator">52 - 1</gadget>
<output>51</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">51 / 3</gadget>
<output>17</output>

<gadget id="calculator">52 + 17</gadget>
<output>69</output>

<result>69</result>