Xiaohong was born on February 29, 1988. How many birthdays did she have until February 29, 2000?
小红1988年2月29日出生，到2000年2月29日，她共过了多少个生日．
<gadget id="calculator">2_000 - 1_988</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>