Given 1997 consecutive natural numbers. It is known that the average of the smallest number and the largest number is 1997, so what is the largest number?
给定1997个连续的自然数．已知其中最小数与最大数的平均值是1997，那么最大的数等于几？
<gadget id="calculator">1_997 * 2</gadget>
<output>3_994</output>

<gadget id="calculator">1_997 - 1</gadget>
<output>1_996</output>

<gadget id="calculator">3_994 + 1_996</gadget>
<output>5_990</output>

<gadget id="calculator">5_990 / 2</gadget>
<output>2_995</output>

<result>2_995</result>