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#include <iostream>
uint32_t count{};
uint32_t bits[806872] = {};
uint32_t bit{};
uint32_t divisor;
uint32_t max{};
int main()
{
	std::cin >> count;
	
	for (uint32_t i = 0; i < count; ++i)
	{
		std::cin >> bit;
		bits[bit]++;
	}

	for (uint32_t i = 0; i < 806872; ++i)
	{
		if (bits[i] != 0)
		{
			max = i;
			divisor = bits[i] / 2;
			if (divisor != 0)
			{
				bits[i + 1] += divisor;
			}
		}
	}
	std::cout << max;
	return 0;
}