/**
 * Copyright ITOIT Meditatii SRL
 * Lesson challenge
 */
#include <iostream>

using namespace std;

// Descrieti in limbaj natural ce face programul de mai jos.

int main()
{
    int v[20], n, s = 0;
    cin >> n;
    for(int i = 0; i < n; ++i)
        cin >> v[i];

    for(int i = 0; i < n; ++i)
        if(v[i] % 2 == 0)
            s += v[i];

    cout << s;
    return 0;
}