Sum of even numbers#8914

Sum of even numbers

1 second
64 megabytes
Very easy

The program processes a sequence of integers, which concludes with the number . Your task is to calculate the sum of all even numbers in this sequence, not including the final zero.

Input

A sequence of integers, with each number provided on a separate line.

Output

A single integer representing the sum of the even numbers in the sequence.

Examples

Example 1

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Example 2

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