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#include <iostream>

int main(int argc, char** argv) {
	long long n;
	unsigned long long a;
	unsigned long long *sum;

	unsigned long long size = (201718 * 20 / (8 * sizeof(unsigned long long))) + 1;
	sum = new unsigned long long[size];

	for (unsigned long long i = 0; i < size; i++) {
		sum[i] = 0;
	}

	std::cin >> n;
	for (long long i = 0; i< n; i++) {
		std::cin >> a;

		unsigned long long index = a/64;
		unsigned long long value = 1ULL << (a%64);

		if (sum[index] >= -value) {
			sum[index + 1]++;
		}
		sum[index] += value;
	}

	unsigned long long max_index = 0;
	unsigned long long max_value;

	for (unsigned long long i = 0; i < size; i++) {
		if (sum[i]) {
			max_index = i;
		}
	}

	max_value = max_index * 64;

	unsigned long long temp = sum[max_index];
	while (temp >>= 1) {
		max_value++;
	}

	std::cout << max_value;

	delete [] sum;

	return 0;
}