[Project Euler]Problem 2 - By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

先建一個小於等於四百萬的費氏數列表，
然後把每一個值是偶數的項都加起來即可。

[Ruby]

	f = Array.new
	f[1] = 1
	f[2] = 1
	i = 2
	while f[i] <= 4000000
	i = i+1
	f[i] = f[i-1] + f[i-2]
	end
	j = 1
	sum = 0
	while j < i
	if f[j] % 2 == 0
	sum += f[j]
	end
	j = j+1
	end
	p sum

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