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#include<iostream>

using namespace std;

const int MAX_SIZE = 202000;

int main() {
	ios_base::sync_with_stdio(0);
	int n;
	int *tab;
	tab = new int[MAX_SIZE];
	for(int i=0;i<MAX_SIZE;i++)
		tab[i] = 0;
	cin >> n;
	for(int i=0;i<n;i++) {
		int tmp;
		cin >> tmp;
		tab[tmp]++;
	}
	int res = 0;
	for(int i=1;i<MAX_SIZE;i++) {
		tab[i] += tab[i-1] / 2;
		if(tab[i] > 0)
			res = i;
	}
	cout << res;
}