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#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

int main()
{
	int n;
	vector<int> numbers;
	cin >> n;
	int d;
	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		cin >> d;
		numbers.push_back(d);
	}
	for (int i = 0; i < numbers.size(); i++)
	{
		sum += pow(2, numbers[i]);
	}	
	int result = 0;
	for (int i = 0; true; i++)
	{
		if (pow(2, i) > sum)
		{
			result = i - 1;
			break;
		}
	}
	cout << result << endl;
	return 0;
}