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#include<iostream>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);

    int p, np;
    p = np = -1;

    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        int x;
        cin >> x;

        if (x % 2 == 0)
        {
            if (p != -1) p += x;
            else p = x;

            if (np != -1) np += x;
        }
        else
        {
            int snp = np;

            if (p != -1) np = max(np, p + x);

            if (snp != -1) p = max(p, snp + x);
            else  np = max(np,  x);
        }

   //     cout << p << "\\" << np << "\n";
    }

    if (p == -1) cout << "NIESTETY\n";
    else cout << p << "\n";


    return 0;
}