There are 8 floors in a building, and there are 15 steps to go up each floor. How many steps does Dad and Mingming need to walk from the 1st floor to the 8th floor?
一幢楼共8层，每上1层要走15级台阶，爸爸和明明从1层走到8层共需走多少级台阶．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<result>105</result>