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#include <iostream>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);

	const auto NELEM = 201800;
	int max = 0;
	int tab[NELEM] = {0};

	int n;
	cin >> n;
	for (auto i = 0; i < n; i++)
	{
		int a;
		cin >> a;
		tab[a]++;
	}

	for (auto i = 0; i < NELEM-1; i++)
	{
		if (tab[i] > 1) {
			tab[i+1] += tab[i] / 2;
		}
		if (tab[i]) max = i;
	}

	cout << max << endl;

	return 0;
}