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#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

const int MAXA = 2017180;

int numberOfCoins[MAXA];

int main() {
  ios_base::sync_with_stdio(0);

  int n;
  cin >> n;

  for (int i = 0; i < n; i++) {
    int coin;
    cin >> coin;
    numberOfCoins[coin]++;
  }

  int currentMax = 0;
  for (int i = 1; i < MAXA; i++)
    if (numberOfCoins[i] != 0) {
      currentMax = i;
      numberOfCoins[i+1] += numberOfCoins[i]/2;
    }

  cout << currentMax << "\n";

  return 0;
}