A certain parking lot charges regulations: the first hour of a car is charged at 3 yuan, and the subsequent hour is charged at 4 yuan. How much should the administrator charge for a car parked for 6 hours?
某停车场收费规定：小轿车第一小时收费3元，以后的每小时收费4元．一辆小轿车停车6小时，管理员应收费多少元？
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">3 + 20</gadget>
<output>23</output>

<result>23</result>