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#include<iostream>
using namespace std;
int main() {
	int n, a, max=-1, odp=0;
	int *monet = new int[201720]();
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a;
		monet[a]++;
		if (a > max)
			max = a;
	}
	for (int i = 0; i <= max; i++)
	{
		if (monet[i] > 0)
			odp = i;
		monet[i + 1] += monet[i] / 2;
	}
	if (monet[max + 1] > 0)
		while (monet[max + 1] >= 1) {
			monet[max + 1] /= 2;
			odp++;
		}
	cout << odp;
	return 0;
}