There is a barrel of oil in the cafeteria, half of it is eaten on the first day, more than 1 kg, half of the remaining oil is eaten on the second day, more than 2 kg, and half of the remaining oil is eaten on the third day, and the remaining half of the oil is more than 3 kg, and finally there is still left in the barrel Take 2 kilograms and ask how many kilograms of oil are in the barrel.
食堂有一桶油，第一天吃掉一半多l千克，第二天吃掉剩下的油一半多2千克，第三天吃掉再剩下的油的一半多3千克，最后桶里还剩下2千克，问桶里原来有多少千克油．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

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

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

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>