#include <fstream>
#include <iostream>
#include <math.h>
using namespace std;
 
long calc(long nums[], int index)
{
    if (index == -1)
    {
        return 0;
    }
    return (nums[index] % 2 == 0)
               ? nums[index] + calc(nums, index - 1)
               : calc(nums, index - 1);
}
 
int main()
{
    // freopen("b8.txt", "r", stdin);
 
    int n;
    cin >> n;
    long nums[n];
    for (int i = 0; i < n; i++)
    {
        cin >> nums[i];
    }
 
    cout << calc(nums, n - 1) << endl;
 
    return 0;
}

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