The sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ... is called the Fibonacci sequence. How many even numbers are there in the first 2004 numbers of the Fibonacci sequence?
数列1，1，2，3，5，8，13，21，34，55，…叫做斐波那契数列，在斐波那契数列的前2004个数中共有多少个偶数．
<gadget id="calculator">2_004 / 3</gadget>
<output>668</output>

<result>668</result>