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// ConsoleApplication1.cpp : Defines the entry point for the console application.
//
#include <iostream>
long long tab[201719];

using namespace std;
int main()
{
	ios_base::sync_with_stdio(0);
	int N, a; 
	cin >> N;
	int maks = 0;
	for (int i = 0; i < N; i++) {
		cin >> a;
		if (maks < a) {
			maks = a;
		}
		tab[a]++;
	}
	//cout << "MAKS" << maks << endl;
	//cout << endl;
	int poz = maks;
	for (int i = 0; i < maks+1; i++) {

		tab[i] +=( tab[i - 1] / 2 );
	}
	 // teraz jestem na miejscu z najwyzsza potega dwojki
	long long wyn = tab[poz];
	long long dod = 0;
	while (wyn > 1) {
		dod++;
		wyn = wyn / 2;
	}
	cout << poz + dod;
	//cin >> a;
	return 0;
}