There are between 20 and 30 peaches in a pile, 1 is left in a pile of 2, 1 is left in a pile of 3, 1 is left in a pile of 4, how many peaches are there in this pile?
一堆桃子在20个至30个之间，2个一堆剩1个，3个一堆剩1个，4个一堆剩1个，这堆桃子有多少个？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>