A set of books is published every 5 years. The sum of the years of publication of the first 5 books is 9795. How many years was the first book of this set of books published?
一套书每隔5年出一本，前5本出版的年代数的和是9795，这套书的第一本是多少年出版的．
<gadget id="calculator">9_795 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5 - 5</gadget>
<output>9_745</output>

<gadget id="calculator">1 + 1 + 1 + 1 + 1</gadget>
<output>5</output>

<gadget id="calculator">9_745 / 5</gadget>
<output>1_949</output>

<result>1_949</result>