Put 268 numbers on a circle, the sum of any consecutive 20 numbers is equal to 80, and the number in the 17th position is 3, the number in the 83rd position is 4, and the number in the 144th position is 9 ． So what is the number placed in the 210th position?
将268个数放在一个圆周上，任意连续的20个数字之和等于80，且放在第17号位置的数为3，第83号位置的数为4，第144号位置的数是9．那么放在第210号位置的数是多少．
<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">16 - 3 - 4 - 0</gadget>
<output>9</output>

<result>9</result>