What is the sum of two integers adjacent to 450?
与450相邻的两个整数的和是多少．
<gadget id="calculator">450 - 1</gadget>
<output>449</output>

<gadget id="calculator">450 + 1</gadget>
<output>451</output>

<gadget id="calculator">449 + 451</gadget>
<output>900</output>

<result>900</result>