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#include <iostream>
#include <vector>

using namespace std;



int main(){

  int n;
  cin >> n;
  long long cur = 0;
  int ret = 0;
  vector <int> numbs (201719, 0);
  for(int i = 0; i < n; i ++){
    int tmp;
    cin >> tmp;
    numbs[tmp]++;
  }

  int i = 0;
  for(auto a : numbs){
    cur /= 2;
    cur += a;
    if(cur > 0){
      ret = i;
    }
    i ++;
  }
  while(cur > 1){
    cur /= 2;
    ret ++;
  }
  cout << ret << endl;

}