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#include <iostream>
#include <vector>
#include <algorithm>

#define MAX 210000

using namespace std;

typedef long long LL;

vector < LL > monety(MAX, 0);

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

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

	int mx = 0;
	for(int i = 1; i < MAX; ++i) {
		monety[i] += monety[i-1]/2;
		if(monety[i] > 0) {
			mx = i;
		}
	}

	cout << mx << endl;
	
	return 0;
}