#include <iostream>
#include <bits/stdc++.h>
using ll = long long;
using namespace std;

const ll INF = 1e18;

int main()
{
    int n; cin >> n;
    vector<int> a(n);
    vector<int> b(n);
    vector<ll> prefa(n+1, 0);
    vector<ll> prefb(n+1, 0);
    for (int i = 0; i < n; i++){
        cin >> a[i];
        prefa[i+1] = a[i] + prefa[i];
    }
    for (int i = 0; i < n; i++){
        cin >> b[i];
        prefb[i+1] = b[i] + prefb[i];
    }
    ll ans = 0;
    ll minans = INF;
    for (int i = 0; i <= n; i++){
        ans = min(prefa[i] + prefb[n] - prefb[i], prefb[i] + prefa[n] - prefa[i]);
        if (ans < minans) minans = ans;
    }
    cout << minans;
    return 0;
}