Like 1, 3, 5, 7, ... are consecutive odd numbers starting from 1, so what is the 2008th odd number among them?
像1、3、5、7、…是从1开始的连续奇数，那么其中第2008个奇数是多少．
<gadget id="calculator">2 * 2_008</gadget>
<output>4_016</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">4_016 - 1</gadget>
<output>4_015</output>

<result>4_015</result>