Parking in a car parking lot costs 5 yuan once (limited time is within 4 hours). If you park for more than 4 hours, you will have to pay an additional 1.5 yuan for each additional hour. Dongdong's car has been parked for 6 hours in total. How much does Dongdong's father have to pay for parking?
在一个汽车停车场停车一次要交费5元(限定时间为4小时以内)．如果停车超过4小时，每多停1小时要多交1.5元．冬冬家的汽车一共停了6小时，冬冬的爸爸要付多少停车费？
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<result>8</result>