#include <bits/stdc++.h>
using namespace std;
 
int workingWeeks(vector<int> proj) {
    long long total = 0;
    int mx = 0;
    for (int x : proj) {
        total += x;
        mx = max(mx, x);
    }
    long long rest = total - mx;
    if (mx > rest + 1) return 2 * rest + 1;
    return total;
}
 
int main() {
    int n;
    cin >> n;
    vector<int> proj(n);
    for (int i = 0; i < n; i++) cin >> proj[i];
    cout << workingWeeks(proj);
    return 0;
}
 

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