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

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

int main()
{
    int v[20], n, s = 0;
    scanf("%d", &n);
    for(int i = 0; i < n; ++i)
        scanf("%d", &v[i]);

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

    printf("%d", s);
    return 0;
}