The lengths of the three sides of an acute triangle are all two digits, and they are three consecutive even numbers, and the sum of their single digits is a multiple of 7. What is the longest perimeter of the triangle in centimeters?
一个锐角三角形的三条边的长度都是两位数，而且是三个连续偶数，它们个位数字的和是7的倍数．这个三角形的周长最长应该是多少厘米？
<gadget id="calculator">86 + 88 + 90</gadget>
<output>264</output>

<result>264</result>