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#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;

int main() {
  int n;
  cin >> n;
  
  int size = 201718;
  
  int * array = new int [size+1]();
  
  //cout << "przeszlo\n";
  getchar();
  for (int i=0; i<n; i++){
	    char c = '0';
		int c_number = 0;
	    int x = 0;
		do{
			c_number = (int)c - 48;
			x = x*10 + c_number;
			c = getchar();
		}while(c >= 48 && c < 58);
		//cout << "znalazlem: " << x << "\n";
		
		++array[x];
  }
  
  int max_no_zero = 0;
  
  for(int i=0; i<size; i++){
	array[i+1] += (array[i] / 2);
	if (array[i+1] > 0){
		max_no_zero = i+1;
	}
  }
  int k = max_no_zero;
  int counter = array[max_no_zero];
  while(counter > 1){
	  counter /= 2;
	  ++k;
  }
  
  cout << k << "\n";
  delete[] array;
  
  return 0;
}