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#include <iostream>

using namespace std;

const int MAX = 201718;


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

	int n, t;
	int max = 0;
	int M[MAX + 100] = { 0 };

	cin >> n;

	while (n--)
	{
		cin >> t;
		if (t > max) max = t;
		M[t]++;
	}

	int curv = 0, a = 0;

	for (int i = 0; i <= max; i++)
	{
		curv /= 2;
		curv += M[i];

		if (curv) a = i;
	}

	while (curv /= 2)
	{
		a++;
	}

	printf("%d\n", a);

	return 0;
}