There are 140 people crossing the river, and a ferry boat can only carry 17 people at a time. After crossing the river 5 times, how many people still have not crossed the river?
河边有140人要过河，一只渡船每次限载17人，渡了5次后，还有多少人没有过河？
<gadget id="calculator">17 * 5</gadget>
<output>85</output>

<gadget id="calculator">140 - 85</gadget>
<output>55</output>

<result>55</result>