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#include <cstdio>
#include <cstdint>
#include <cinttypes>
#include <unordered_map>

std::unordered_map<uint32_t, uint32_t> values_counts;
uint32_t max_value = 0;

inline void insert_and_aggregate(uint32_t value) {
	while (1) {
		if (value > max_value) {
			max_value = value;
		}
		auto &value_count = values_counts[value];
		value_count += 1;
		if (value_count == 2) {
			value_count = 0;
			value = value + 1;
		} else {
			break;
		}
	}
}

int main(int argc, char const *argv[]) {
	uint32_t count;
	scanf("%" PRIu32, &count);

	uint32_t value;
	while (count--) {
		scanf("%" PRIu32, &value);
		insert_and_aggregate(value);
	}

	printf("%" PRIu32 "\n", max_value);

	return 0;
}