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 = 0;

k = 1;

while fibonacci(k) <= 4000000

    if fibonacci(k)/2 - floor(fibonacci(k)/2) == 0

        x = x + fibonacci(k);

    end

k = k + 1;

end

x