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# Problem 2

## Even Fibonacci numbers

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with $1$ and $2$, the first $10$ terms will be:

$$1, 2, 3, 5, 8, 13, 21, 34, 55, 89, \ldots$$

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

## 偶斐波那契数

$$1, 2, 3, 5, 8, 13, 21, 34, 55, 89, \ldots$$