There is a 6-story building with the same number of steps between every two floors. If there are 30 steps from the first floor to the third floor, how many steps did Xiao Ming take when he walked from the bottom floor to the top floor?
有一幢6层楼房，每两层之间台阶数相同，如果从第一层到第三层共有30级台阶，那么当小明从底层走到顶层时一共跨了多少级台阶？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>