The number of people participating in the interest group this year is 52 more than last year, and the number of this year is 1 person more than four times that of last year. How many people participated in the interest group this year?
参加兴趣小组的人数今年比去年多52人，今年的人数比去年的4倍多1人，今年参加兴趣小组的有多少人？
<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>