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#include <iostream>
#include <vector>

using namespace std;

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

	vector<int> monety(210000);
	int n;
	cin >> n;

	for (int i = 0; i < n; i++) {
		int m;
		cin >> m;
		monety[m] += 1;
	}

	for (int i = 0; i < monety.size(); i++) {
		int m = monety[i];
		int div = 2;
		monety[i] = m % div; // residue
		m = m / 2;
		int cnt = 0;
		while (m > 0) {
			int res = m % 2;
			m = m / 2;
			cnt++;
			monety[cnt+i] += res;
		}
	}

	for(int i = monety.size() - 1; i >= 0; i--) {
		if(monety[i] > 0) {
			cout << i << endl;
			return 0;
		}
	}

	return 0;
}