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#include <stdio.h>
#include <stdlib.h>
#define swap(a,b) \
{\
int t;\
t=a; a=b; b=t;\
}

void bubble_sort(int *d,int n);

int main()
{
    int i, banknoty, suma=0;
    scanf ("%i\n", &banknoty);
    int *nominaly = (int*)malloc(banknoty * sizeof(int));
    for (i=0;i<banknoty;i++) {
    	scanf("%i",&nominaly[i]);
    	suma+=nominaly[i];
    	}
    bubble_sort(nominaly,banknoty);
    if (suma%2==0) {
		printf("%i", suma);
		return 0; }
    for(i=0;i<banknoty;i++) {
    	
    //	if (nominaly[i-1]==nominaly[i]) continue;
    	if ((suma-nominaly[i])%2==0) {
			printf ("\n%i",suma-nominaly[i]);
			return 0; }
		}
	printf("Niestety");
	return 0;
}

void bubble_sort(int *d,int n)
{
    int i,j;
    for (i=0;i<n;i++)
    for (j=n-1;j>i;j--)
    if(d[j]<d[j-1])
    swap(d[j-1],d[j]);
}