2001 can be written as the sum of two prime numbers, so what is the product of these two prime numbers?
2001可写成两个质数之和，那么这两个质数之积是多少．
<gadget id="calculator">2_001 - 2</gadget>
<output>1_999</output>

<gadget id="calculator">2 * 1_999</gadget>
<output>3_998</output>

<result>3_998</result>