There is a series of addition formulas, 4+2, 5+8, 6+14, 7+20, ..., the first addends of these formulas are arranged according to the law, and the second addends are also arranged according to the law. What are the 99 formulas?
有一列加法算式，4+2、5+8、6+14、7+20、…，这些算式的第一个加数是按规律排列的，第二个加数也是按规律排列的，问第99个算式是多少．
<gadget id="calculator">99 - 1</gadget>
<output>98</output>

<gadget id="calculator">98 + 4</gadget>
<output>102</output>

<gadget id="calculator">6 * 98</gadget>
<output>588</output>

<gadget id="calculator">588 + 2</gadget>
<output>590</output>

<gadget id="calculator">102 + 590</gadget>
<output>692</output>

<result>692</result>