Xiao Ming, Xiao Li, Xiao Wang, and Xiao Liu use 16 kg, 14 kg, 12 kg, and 10 kg buckets to draw water from the same faucet respectively. Assuming that the flow rate per minute is 1 kg, then the four people are waiting to fetch water. What is the minimum total time in minutes?
小明、小李、小王、小刘四人分别用16千克、14千克、12千克、10千克的水桶在同一水龙头下打水，假设每分钟的流量是1千克，那么四人等待打水的总时间最少是多少分钟？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">16 * 1</gadget>
<output>16</output>

<gadget id="calculator">40 + 36 + 28 + 16</gadget>
<output>120</output>

<result>120</result>