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#include <iostream>
using namespace std;

int maxSize = 201737;
int coins[201738];
int n;
int a;
int result;
int maxCoin = 0;

int main() {

	cin >> n;

	for (int i = 0; i < n; i++) {
		cin >> a;
		coins[a]++;
		if (a > maxCoin) {
			maxCoin = a;
		}
	}

	for (int i = 1; i <= maxCoin + 19; i++) {
		if (coins[i] > 0) {
			result = i;
		}
		if (coins[i] > 1) {
			coins[i + 1] += coins[i] / 2;
		}
	}

	cout << result << endl;
	return 0;
}