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#include<bits/stdc++.h>

using namespace std;
int main()

{
    int ilosc;
    cin >> ilosc;
    vector<int> ile (1001);
    for (int i=0; i<1001; ++i) ile[i] = 0;
    for (int i=0; i<ilosc; ++i)
    {
        int a;
        cin >> a;
        ile[a]++;
    }
    int result = 0;
    for (int i=0 ; i<1001; i+=2)
        result+=i*ile[i];

    int ileniep = 0;
    for (int i=0; i<1001; i+=2)
    {
        ileniep+=ile[i];
    }
    if (ileniep==0 && ilosc==1) cout << "NIESTETY" << endl;
    else
    {
        int temp;
        int left=0;
        for (int i=999; i>0; i-=2)
        {
            if (ile[i]==0) continue;
            if (left==0)
            {
                if (ile[i]%2==0)
                    result+=i*ile[i];
                else
                {
                    result += i*(ile[i]-1);
                    left = i;
                }
            }
            else
            {
                ile[i]--;
                result+=left+i;
                left=0;
                if (ile[i]%2==0)
                    result+=i*ile[i];
                else
                {
                    result += i*(ile[i]-1);
                    left = i;
                }
            }
        }
        cout << result << endl;
    }
}