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#ifdef _MSC_VER
  #ifndef __GNUC__
    #pragma warning(disable: 4996)
  #endif
  #define main main0
#endif
#include <iostream>
#include <vector>
using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  //cin.tie(NULL);

  vector<char> coins(201750, 0);
  int n, coin, maxCoin = 0;
  cin >> n;

  for(int i = 0; i < n; ++i) {
    cin >> coin;
    for(; coins[coin] != 0; ++coin)
      coins[coin] = 0;
    coins[coin] = 1;
    if(maxCoin < coin)
      maxCoin = coin;
  }

  cout << maxCoin << '\n';

  return 0;
}