Calculation: 20032003*2003-20032002*2002-20032002=how much.
计算：20032003*2003-20032002*2002-20032002=多少．
<gadget id="calculator">20_032_003 * 2_003</gadget>
<output>40_124_102_009</output>

<gadget id="calculator">20_032_002 * 2_002</gadget>
<output>40_104_068_004</output>

<gadget id="calculator">40_124_102_009 - 40_104_068_004 - 20_032_002</gadget>
<output>2_003</output>

<result>2_003</result>