There are 25 steps between every two floors of a dormitory building. How many steps does a student walk from the first floor to the fourth floor?
一幢宿舍楼每两层楼之间有25个台阶，一个同学从一楼走到四楼，他走了多少个台阶．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<result>75</result>