#include <bits/stdc++.h>
#define ll long long

using namespace std;

int main() {
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    int n;
    cin >> n;
    vector<ll>v(n);
    for (int i=0; i<n; i++) {
        cin >> v[i];
    }
    vector<ll>ps(n);
    for (int i=0; i<n; i++) {
        ps[i]=v[i];
        if (i) ps[i]+=ps[i-1];
    }
    vector<ll>ss(n);
    for (int i=n-1; i>=0; i--) {
        ss[i]=v[i];
        if (i<n-1) ss[i]+=ss[i+1];
    }
    set<ll>s;
    priority_queue<ll>p;
    for (int i=0; i<n; i++) {
        for (int j=n-1; j>i; j--) {
            if (ss[j]==ps[i]) p.push(ps[i]);
        }
    }
    cout << p.top() << endl;
    return 0;
}