A peach tree is full of ripe peaches, and a little monkey is known to steal them. On the first day, he ate half of the peaches and 2 more, and on the second day, he ate the remaining half and 2 less. At this time, there are still 20 peaches on the tree. How many peaches are there in this peach tree?
一棵桃树长满了成熟的桃，已知小猴去偷吃．第一天偷吃了一半多2个，第二天偷吃了剩下的一半少2个，这时树上还有20个桃，这棵桃树原有多少个桃？
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 + 2</gadget>
<output>38</output>

<gadget id="calculator">38 * 2</gadget>
<output>76</output>

<result>76</result>