1996+1994-1992-1990+1998+1986-1984-1982+1980+1978-1976-1974+1972+1970...+4+2=how much.
1996+1994-1992-1990+1998+1986-1984-1982+1980+1978-1976-1974+1972+1970…+4+2=多少．
<gadget id="calculator">249 * 8</gadget>
<output>1_992</output>

<gadget id="calculator">1_992 + 4 + 2</gadget>
<output>1_998</output>

<result>1_998</result>