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#include <iostream>
#define NOMINALY 202000
using namespace std;

void zeruj(int a[], int n)
{
  for (int i = 0; i < n; i++)
    a[i] = 0;
}

int main()
{
  int n, a, r = 0, maxn = 0;
  int monety[NOMINALY];
  zeruj(monety, NOMINALY);
  cin>>n;
  for (int i = 0; i < n; i++)
  {
    cin>>a;
    monety[a]++;
  }
  for (int i = 0; i < NOMINALY; i++)
  {
    monety[i] += r;
    if (monety[i] > 0)
      maxn = i;
    r = monety[i] / 2;
    monety[i] %= 2;
  }
  cout<<maxn<<"\n";
  
  return 0;
}