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#include<iostream>
#include<stdio.h>

using namespace std;
int banknoty[1001];
int main()
{
	long long suma=0;
	int np=0;
	int n;
	cin>>n;
	for(int i=1;i<=1000;i++)
		banknoty[i]=0;
	while(n--)
	{
		int x;
		scanf("%d",&x);
		if((x%2)==0)
			suma+=x;
		else
		{	
			np++;
			banknoty[x]++;
		}
	}
	//cout<<suma<<" "<<np<<endl;
	
	if((suma==0)&&((np%2)==1))
		cout<<"NIESTETY";
	else if(np>0)
	{
		if((np%2)==1) np--;
		int i=999;
		while(np>0)
		{
		//	cout<<np<<endl;
			suma+=banknoty[i]*i;
			if(banknoty[i]>np) suma-=i;
			np-=banknoty[i];
			i=i-2;
		}
		cout<<suma;	
	}	
	else
		cout<<suma;	
//	system("pause");
}