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.

Contraintes

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

Exemples

Entrée :
limit = 50

Sortie attendue :
expected = 44

Entrée :
long long limit = 50;

Sortie attendue :
long long expected = 44;

Entrée :
long limit = 50;

Sortie attendue :
long expected = 44;

Entrée :
limit = 1

Sortie attendue :
expected = 0

Entrée :
long long limit = 1;

Sortie attendue :
long long expected = 0;

Entrée :
long limit = 1;

Sortie attendue :
long expected = 0;

Références

Ce défi a été adapté pour CodeUtility. Suivez l'énoncé et les contraintes ci-dessus.

• #2 Even Fibonacci Numbers