Three customers, A, B, and C, came to the barber shop at the same time, and there was only one barber in the barber shop. According to the characteristics of the customer's hairstyle, A will take 15 minutes, B will take 25 minutes, and C will take 30 minutes. How can the arrangements be made to minimize the total waiting time of the three barbers? How many minutes is the minimum?
理发店同时来了甲，乙，丙三位顾客，而店里只有一位理发师．根据客人的发型特点，甲要15分钟，乙要25分钟，丙要30分钟，怎样安排可以使3位理发者等侯时间总和最少？最少是多少分钟？
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">45 + 50 + 30</gadget>
<output>125</output>

<result>125</result>