#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> v(n);
  int t = 1;
  for (int i = 0; i < n; ++i) {
    cin >> v[i];
  }
  sort(v.begin(), v.end());
  for (int i = 0; i < n; ++i) {
    if (v[i] == t) t++;
  }
  cout << t;
  return 0;
}
