Sum of Even Numbers

ArrayMath

Given an array of integers, compute the sum of all the even numbers in the array.

Example 1

Input

[
  2,
  5,
  3,
  8,
  12
]

Output

Explanation. The even numbers in the array are 2, 8, and 12. Their sum is 22.

Example 2

Input

[
  7,
  13,
  10
]

Output

Explanation. The only even number in the array is 10.

Example 3

Input

[
  -2,
  -3,
  -6
]

Output

-8

Explanation. The even numbers are -2 and -6, and their sum is -8.

Follow-up: What would be the most optimal way to execute this operation if the input size is very large?

Constraints:

The input array can contain both positive and negative integers, but will always have at least one element.