Sum Even Fibonacci Terms

Begin the sequence with 1 and 2. Each following term is the sum of the previous two. Include only even-valued terms no greater than limit, then add them.

Implement even_fibonacci_sum(limit).

Input

limit: The largest term value that may be included.

Output

Return the sum, or 0 if there are no eligible terms.

Restricciones

0 ≤ limit ≤ 10¹⁵. The result fits a signed 64-bit integer.

Ejemplos

Entrada:
limit = 50

Salida esperada:
expected = 44

Entrada:
long long limit = 50;

Salida esperada:
long long expected = 44;

Entrada:
long limit = 50;

Salida esperada:
long expected = 44;

Entrada:
limit = 1

Salida esperada:
expected = 0

Entrada:
long long limit = 1;

Salida esperada:
long long expected = 0;

Entrada:
long limit = 1;

Salida esperada:
long expected = 0;

Referencias

Este reto está adaptado para CodeUtility. Sigue el enunciado y las restricciones indicadas arriba.

• #2 Even Fibonacci Numbers