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#include <iostream>


using namespace std;

int tab[1000001];

int main()
{
	ios_base::sync_with_stdio(0);

	long long n;
	int x, xam = 0;
	cin >> n;
	for (long long i=0; i < n; i++)
	{
		cin >> x;

		if (x > xam)
			xam = x;

		tab[x]++;

	}

	for (long long i = 1; i <= xam; i++)
		tab[i] += tab[i - 1] / 2;

	if (tab[xam + 1] != 0)
		cout << xam+2;
	else
		cout << xam+1;

	return 0;
}