It is known that a*b+6=x, where a and b are both prime numbers less than 100, and x is an even number, then what is the maximum value of x.
已知a*b+6=x，其中a、b都是小于100的质数，x是偶数，那么x的最大值是多少．
<gadget id="calculator">2 * 97</gadget>
<output>194</output>

<gadget id="calculator">194 + 6</gadget>
<output>200</output>

<result>200</result>