Calculation: 991*999+992*998+993*997+994*996+995*995=how much.
计算：991*999+992*998+993*997+994*996+995*995=多少．
<gadget id="calculator">991 * 999</gadget>
<output>990_009</output>

<gadget id="calculator">992 * 998</gadget>
<output>990_016</output>

<gadget id="calculator">993 * 997</gadget>
<output>990_021</output>

<gadget id="calculator">994 * 996</gadget>
<output>990_024</output>

<gadget id="calculator">995 * 995</gadget>
<output>990_025</output>

<gadget id="calculator">990_009 + 990_016 + 990_021 + 990_024 + 990_025</gadget>
<output>4_950_095</output>

<result>4_950_095</result>