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#include<iostream>
#include<cstdio>

using namespace std;

long long int n;
long long int a[1000];
long long int suma;

main()
{
    scanf("%lld", &n);
    for(long long int i = 0; i < n; i++)
    {
	long long int d;
	scanf("%lld", &d);
	if(d % 2 == 0)
	    suma += d;
	else
	    a[d]++;
    }
    long long int k = 0;
    for(int i = 999; i >= 1; i -= 2)
    {
	if(a[i])
	{
	    if(k)
	    {
		suma += k + i;
		a[i]--;
		k = 0;
	    }
	    if(a[i] % 2 == 1)
	    {
	        k = i;
	        a[i]--;
	    }
	    suma += a[i] * i;
	}
    }
    if(suma)
	printf("%lld\n", suma);
    else
	printf("NIESTETY\n");
}