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#include <set>
#include <iostream>
#include <vector>

using namespace std;

#define LICZBA_NOMINALOW 1001
typedef long long LL;

int nominaly[LICZBA_NOMINALOW];

int main () {
	
	int n, ai;
	LL s = 0;	
	cin >> n;
	while(n--) {
		cin >> ai;
		nominaly[ai]++;
		s += ai;
	}
	if (s%2 == 0) {
		cout << s << endl;
	} else {
		for (n=1; nominaly[n]==0 && n<LICZBA_NOMINALOW; n+=2);
		if (s-n>0) {
			cout << s-n << endl;
		} else {
			cout << "NIESTETY" << endl;
		}
	}
	
	return 0;
}