#include <bits/stdc++.h>
#define endl '\n'

using namespace std;
template<class T, class T1> inline void chkmax(T &x, const T1 &y) { if (x < y) x = y; }
template<class T, class T1> inline void chkmin(T &x, const T1 &y) { if (x > y) x = y; }

const string TASK_NAME = "evensum";
const bool DEBUG = false;
const int MAXN = 100000;

int N;
int A[MAXN];

void read()
{
    cin >> N;
    for (int i = 0; i < N; i++)
        cin >> A[i];
}

long long get_sum()
{
    long long sum = 0ll;
    for (int i = 0; i < N; i++)
        sum += (long long)A[i];
    return sum;
}

void solve()
{
    sort(A, A + N);
    long long sum = get_sum();
    long long ans = 0ll;
    for (int i = 0; i < N; i++)
    {
        if (!(sum & 1ll))
            chkmax(ans, sum);
        sum -= A[i];
    }
    sum = get_sum();
    for (int i = N - 1; i >= 0; i--)
    {
        if (!(sum & 1ll))
            chkmax(ans, sum);
        sum -= A[i];
    }
    cout << ans << endl;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if (!DEBUG)
    {
        freopen((TASK_NAME + ".in").c_str(), "rt", stdin);
        freopen((TASK_NAME + ".out").c_str(), "wt", stdout);
    }

    read();
    solve();

    return EXIT_SUCCESS;
}