Binary Bane: Level 3

You've made it to Level 3, but don't get too cocky. The binary code is getting harder, and the bane is getting angrier.

Here's your challenge:

Write a function to find the sum of all even numbers in an array of integers. The array will contain only 1s and 0s, and it's guaranteed that the 1s come first, followed by a 0, then another 1, another 0, and so on.

Example input: 11010010

Example output: 4

Go, binary bane! (Even Number Summer)

(Level 4: Parma Cipher is waiting, if you're feeling brave)