It takes Xiaolin 28 seconds to go from the first floor to the third floor, and the number of stairs between each floor is the same. According to this calculation, how many seconds does it take him to go from the third floor to the seventh floor.
小林从一楼到三楼需要28秒，每层楼间的楼梯级数相同．照这样计算，他从三楼到七楼需要多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">14 * 4</gadget>
<output>56</output>

<result>56</result>