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#include<cstdio>
#include<iostream>
#include<math.h>
using namespace std;
#define MAX 201719
int main(){
  int T[MAX];
  for (int i=0;i<MAX;i++) T[i]=0;
  int n;
  scanf("%d",&n);
  int mmin = MAX+1;
  int mmax = -1;
  int a;
  while (n--)
  {
    scanf("%d",&a);
    T[a]++;
    if (a<mmin) mmin = a;
    if (a>mmax) mmax = a;
  }
  mmax++;
  int current = 0;
  for (;mmin<mmax;mmin++)
  {
    current/=2;
    current+=T[mmin];
  }
  mmax--;
  while (current!=1)
  {
    current/=2;
    mmax++;
  }
  printf("%d\n",mmax);

}