491

#include<iostream>
using namespace std;
int v[1005];
int main()
{
    int n, pr, ul, iprim, iult, i, s=0;
    cin>>n;
    for(i=1; i<=n; i++)
    {
        cin>>v[i];
        if(v[i]%2==0)
        {
            pr=v[i];
            iprim=i;
            s=s+pr;
            break;
        }
    }
    for(i=iprim; i<=n; i++)
    {
        cin>>v[i];
        if(v[i]%2==0)
        {
            iult=i;
        }
        s=s+v[i];
    }cout<<s;
    for(i=n; i>=iult; i--)
    {
        if(v[i]%2!=0)
        {
            s=s-v[i];
        }
    }
   // cout<<pr<<" "<<ul<<" "<<s;
}