#include <bits/stdc++.h>
using namespace std;
long long mod = 1e9 + 7;
long long inf = 1e18;
double eps = 1e-8;
double pi = acos(-1);
ifstream in("input.txt");
ofstream out("output.txt");
int main() {
  int n;
  cin >> n;
  vector<int> a;
  for (int i = 0; i < n; i++) {
    int t;
    cin >> t;
    a.push_back(t);
  }
  sort(a.begin(), a.end());
  for (int i = 0; i < n; i++) {
    if (i + 1 != a[i]) {
      cout << i + 1 << endl;
      return 0;
    }
  }
  cout << n + 1;
  return 0;
}
