Calculation: 1993+1992-1991-1990+1989+1988-1987-1986+...+5+4-3-2+1=how much.
计算：1993+1992-1991-1990+1989+1988-1987-1986+…+5+4-3-2+1=多少．
<gadget id="calculator">4 * 498</gadget>
<output>1_992</output>

<gadget id="calculator">1_992 + 1</gadget>
<output>1_993</output>

<result>1_993</result>