#include <iostream>

using namespace std;

int main()
{
    ios :: sync_with_stdio(0);
    cin.tie(0);

    int n, a[1001];

    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }

    int first = 1;
    while (a[first] % 2 != 1)
    {
        first++;
    }
    int last = n;
    while (a[last] % 2 != 1)
    {
        last--;
    }

    int sum = 0;
    for (int i = first; i <= last; i++)
    {
        sum += a[i];
    }

    cout << sum;
}