It is necessary to build a rectangular pigsty with an area of 72m**2. The side length of the rectangle is a natural number in meters. What is the minimum length of the wall of this pigsty?
要砌一个面积为72m**2的长方形猪圈，长方形的边长是以米为单位的自然数，这个猪圈的围墙最少长多少米．
<gadget id="calculator">8 + 9</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>