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#include <iostream>
#include <array>

class SKA {
	protected:
		std::array<int, 201740> nominaly;
		int n;
	public:
		SKA() {
			nominaly.fill(0);
			n = 0;
		}
		
		void readInput() {
			std::cin >> n;
			int tmp=0;
			for(int a=0; a<n; a++) {
				std::cin >> tmp;
				nominaly[tmp]++;
			}
		}

		void combine() {
			int num = 0,
				quot = 0,
				lastmax = 0;
			for(int a=0; a<nominaly.size(); a++) {
				num = nominaly[a];
				if (num != 0) {
					quot = num>>1;
					nominaly[a+1] += quot;
					lastmax = a;
				}
			}
			std::cout << lastmax << std::endl;
		}

		void run() {
			readInput();
			combine();
		}
};

int main(int argc, char** argv) {
	std::ios_base::sync_with_stdio(false);

	SKA ska;
	ska.run();

	return 0;
}