1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
#include <iostream>
#include <vector>

using namespace std;

const int MAXV = 210000;
int tab[MAXV];

int main() {
	for (int i = 0; i < MAXV; i++) {
		tab[i] = 0;
	}

	int n, v;
	cin >> n;

	for (int i = 0; i < n; i++) {
		cin >> v;
		tab[v]++;
	}

	int ans = 0;
	for (int i = 0; i < MAXV - 5; i++) {
		if (tab[i] != 0) {
			ans = i;
			tab[i + 1] += tab[i] / 2;
		}
	}

	cout << ans << endl;
}