One floor has 10 steps of stairs, a building has 17 floors, and this building has only 5 corridors. How many stairs are there in this building?
一层楼有10步楼梯，一栋大楼有17层楼，这栋大楼只有5个楼道．这栋大楼共有多少步楼梯．
<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<gadget id="calculator">10 * 16 * 5</gadget>
<output>800</output>

<result>800</result>