A swimming pool is 50 meters long, and I swim 7 back and forth every time. How many times does he swim each time?
一个游泳池长50米，我每次都游7个来回．他每次游多少米米．
<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">50 * 14</gadget>
<output>700</output>

<result>700</result>