In a seven-story building, there are 13 steps between each floor. How many steps does Xiao Ming need to walk from the ground floor to the seventh floor?
一座七层楼房，每层之间的台阶都是13级，小明从底层走到七楼共要走多少级台阶．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">13 * 6</gadget>
<output>78</output>

<result>78</result>