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

x, y, sum = 1, 1, 0
while sum < 4000000
  sum += (x + y)
  x, y = x + 2*y, 2*x + 3*y
end

puts "Answer: #{ sum }."
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