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#include <bits/stdc++.h>

using namespace std;

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  uint32_t arr[201719] = {};
  uint32_t n, tmp;
  cin >> n;
  
  while(n--){
    cin >> tmp;
    arr[tmp]++;
  }
  
  for(int i = 1; i <= 201718; ++i){
    arr[i] += arr[i-1] >>= 1;
    if(arr[i]) tmp = i;
  }
  
  while(arr[201718] >>= 1){
    tmp++;
  }
  
  cout << tmp;
  
}