#include <iostream>

using namespace std;
int v[1001],n,i,p=1,u,s;
int main()
{
    cin>>n;
    for(i=1; i<=n; i++)
        cin>>v[i];
    while(v[p]%2!=0&&p<=n)
        p++;
    if(p==n+1)
    {
        cout<<"NU EXISTA";
        return 0;
    }

    u=n;
    while(v[u]%2!=0&&u>=1)
        u--;

for(i=p;i<=u;i++)
s=s+v[i];
cout<<s;



    return 0;
}