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#include<bits/stdc++.h>
#define rep(i,k,n) for(ll i= (ll) k;i< (ll) n;i++)
#define all(v) (v).begin(), (v).end()
#define SZ(v) (int)((v).size())
#define pb push_back
#define ft first
#define sd second
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
const long long INF = 4e18L + 1;
const int IINF = 2e9 + 1;
const int limit = 1048576;

using namespace std;

int main()
{
#ifndef LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif
	int n;
	cin>>n;
	
	vector < ll > V(n);
	for(auto& el : V)
		cin>>el;
	sort(all(V));
	ll akt = V[0], ile = 1;
	for(int i=1; i<SZ(V); i++)
	{
		while(akt < V[i])
		{
			akt++;
			ile/=2;
		}
		ile++;
	}
	while(ile > 1)
	{
		akt++;
		ile/=2;
	}
	cout<<akt;
	

	return 0;
}