(1686+1683+1689+1681+1691+1685+1687+1678)/8.
(1686+1683+1689+1681+1691+1685+1687+1678)/8．
<gadget id="calculator">1_686 + 1_683 + 1_689 + 1_681 + 1_691 + 1_685 + 1_687 + 1_678</gadget>
<output>13_480</output>

<gadget id="calculator">13_480 / 8</gadget>
<output>1_685</output>

<result>1_685</result>