def fibonacci(n)
  fibTable = []
  if (n == 0) or (n == 1)
    return 1
  else
    if fibTable.at(n-1) == nil
      fibTable.insert(n-1, fibonacci(n-1))
      fib1 = fibTable.at(n-1)
    else
      fib1 = fibTable.at(n-1)
    end
    if fibTable.at(n-2) == nil
      fibTable.insert(n-2, fibonacci(n-2))
      fib2 = fibTable.at(n-2)
    else
      fib2 = fibTable.at(n-2)
    end
    return fib1 + fib2
  end
end

sum = 0
for i in 1..32
  fib = fibonacci(i)
  if (fib%2) == 0
    sum += fib
  end
end

puts sum