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// Potyczki Skarbonka.cpp : Defines the entry point for the console application.
//

#include <set>
#include <stdio.h>

std::set<int> coins;

void insert(int num) {
	std::set<int>::iterator it = coins.find(num);

	if (it == coins.end()) {
		coins.insert(num);
	}
	else {
		it = coins.erase(it);
		num++;

		while (it != coins.end()) {
			if (*it == num) {
				it = coins.erase(it);
				num++;
			}
			else {
				break;
			}
		}

		coins.insert(num);
	}
}

int main()
{

	int n;
	scanf("%i", &n);

	int num = 0;

	for (int i = 0; i < n; i++) {
		scanf("%i", &num);

		insert(num);
	}

	int result = *(coins.rbegin());
	printf("%i\n", result);


    return 0;
}