You need to pay 5 yuan for parking in a parking lot. If you park for more than 2 hours, you need to pay 2 yuan for each additional hour. When a car leaves the parking lot, the owner pays 13 yuan for parking. How many hours does the car park in this parking lot at most?
在一个停车场停车一次要交5元，如果停车时间超过2小时，每多停1小时要多交2元．有辆车离开停车场时，车主付了13元停车费，这辆车在这个停车场最多停了几小时？
<gadget id="calculator">13 - 5</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<result>6</result>