There are three circles with an area of 30 square centimeters each, the overlapping areas of any pair are 5 square centimeters, 6 square centimeters, and 8 square centimeters, and the overlapping area of the three circles is 3 square centimeters. How many square centimeters do the three circles cover?
有三个面积各为30平方厘米的圆，两两重叠的面积分别为5平方厘米、6平方厘米、8平方厘米，三个圆共同重叠的面积为3平方厘米．三个圆共盖住多少平方厘米？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">90 - 5 - 6 - 8</gadget>
<output>71</output>

<gadget id="calculator">71 + 3</gadget>
<output>74</output>

<result>74</result>