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

#include <iostream>

const unsigned int size = 201719;
unsigned int skarbonka[size];

int main()
{
	std::ios_base::sync_with_stdio(0);

	int n, a;
	std::cin >> n;

	for (auto i = 0; i < n; ++i)
	{
		std::cin >> a;
		++skarbonka[a];
	}

	for (auto i = 1; i < size; ++i)
	{
		skarbonka[i] += skarbonka[i - 1] >> 1;
	}

	auto result = size - 1;
	while (!skarbonka[result])
	{
		--result;
	}
	std::cout << result << std::endl;
	
    return 0;
}