#include <bits/stdc++.h>
using namespace std;

int main() {
	long long int a, b[999999], c = 0;
	cin >> a;
	for (int i = 1; i <= a; i++) {
		cin >> b[i];
		if (b[i] % 2 == 0) {
			c += b[i];
		}
	}
	cout << c;
	return 0;
}