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#include <bits/stdc++.h>
#define duzo 300000
using namespace std;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	vector<int> lic(duzo);
	for (int i = 0; i < n; i++)
	{
		int a;
		cin >> a;
		lic[a]++;
	}
	int max = 0;
	for (int i = 0; i < duzo-1; i++)
	{
		if (lic[i])
		{
			max = i;
		}
		lic[i + 1] += lic[i] / 2;
	}
	cout << max;
	return 0;
}