#include<bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;
    int mas[n];
    for (int i = 0; i < n; ++i)
    {
        cin >> mas[i];
    }
    sort(mas, mas + n);
    long long m = 0;
    for (int i = 0; i < n; ++i)
    {
        if (m + 1 < mas[i])
        {
            cout << m + 1; return 0;
        }
        m += mas[i];
    }
    cout << m + 1;
    return 0;
}