The principal talks to three teachers, A, B, and C. He plans to talk with A for 8 minutes, with B for 6 minutes, and with C for 5 minutes. The assistant to the principal adjusts the order of the conversation among the three to minimize the total time for the three to talk and wait. How many minutes is the adjusted time.
校长找甲乙丙三位老师谈话，计划与甲交谈8分钟，与乙交谈6分钟，与丙交谈5分钟，校长助理通过合理调整三人交谈的顺序，使得三人交谈和等待的总时间最少，调整后的用时间为多少分钟．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">8 * 1</gadget>
<output>8</output>

<gadget id="calculator">15 + 12 + 8</gadget>
<output>35</output>

<result>35</result>