building has 10 floors, and there are 2 floors below the ground. The elevator goes up from the 2nd floor below the ground to the 6th floor. How many floors are there in total?
一幢大楼有10层，地面以下有2层，电梯从地面以下第2层上升到6楼，共上升了多少层．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<result>7</result>