Zhang Hong’s family lives on the fifth floor, and each floor has 17 steps. In order to exercise, Zhang Hong has to go from home to the first floor and then back to home every time. This is 5 round trips. How many steps does Zhang Hong walk every time he exercises?
张宏家住在5层，每层有17级台阶，为了锻炼身体，张宏每次要从家到1层再到家，这样往返5次，每次锻炼张宏都要走多少级台阶？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">17 * 4 * 5 * 2</gadget>
<output>680</output>

<result>680</result>