Teacher Wang bought a batch of exercise books as prizes and gave them to everyone. Of these exercise books, there are 2 books with 2 local numbers, 3 books with 3 local numbers, 5 books with 5 local numbers, and 1 book left in the end. How many copies are there at least in this batch of exercise books?
王老师买了一批练习本作为奖品发给大家，这些练习本2本2本地数，3本3本地数，5本5本地数，最后都剩1本，这批练习本至少有多少本？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>