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#include <cstdlib>
#include <iostream>
#include <vector>

using namespace std;

int main()
{
	int n=5, a;

	vector<int> x(202000);
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> a;
		x[a]++;
	}
	int highest = 0;

	for (int i = 0; i < 201999; i++)
	{
		if (x[i] > 0) 
			highest = i;
		x[i + 1] += x[i] / 2;
		x[i] = x[i] % 2;
	}
	cout << highest;
    return 0;
}