parking lot stipulates that a parking fee of at least 5 yuan should be paid for one parking, and an additional 1.5 yuan will be charged for each additional hour of parking for more than 2 hours. Master Liu parks here for 6 hours, how much parking fee should be paid.
某停车场规定：停车一次至少交停车费5元，超过2小时，每多停1小时，加收1.5元，刘师傅在此停车6小时，应交停车费多少元．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">1.5 * 4</gadget>
<output>6</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>