Wang Ming can only celebrate his birthday once every four years, and it will be his tenth birthday in 2008. How old is he in 2008?
王明每四年才能过一次生日，到2008年就是他的第十次生日了，2008年他多少岁．
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<result>40</result>