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// PA2017.cpp : Defines the entry point for the console application.
//
#include <iostream>
using namespace std;

const int MAXA = 201739;//+21
int main()
{
	ios_base::sync_with_stdio(0);
	int an[MAXA];
	int n;

	for (int i = 0; i < MAXA; i++)
		an[i] = 0;
	cin >> n;
	while (n--)
	{
		int a;
		cin >> a;
		an[a]++;
	}

	int b = 0;
	for (int i = 1; i < MAXA; i++)
	{
		an[i] += an[i - 1] / 2;
		if (an[i] > 0)
			b = i;
	}
	cout << b<<endl;

	return 0;
}