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
32
33
34
35
36
37
38
39
40
#include <cstdio>
#include <vector>
#include <map>

using namespace std;

int n,a;
bool t[300000];

int main()
{
	scanf("%d", &n);

	for (int i = 0; i < n; ++i)
	{
		scanf("%d", &a);

		int j = a;
		while (t[j] == true)
		{
			t[j] = false;
			j++;
		}
		t[j] = true;
	}


	int max = 0;
	for (int i = 0; i < 300000; ++i)
	{
		if (t[i] == true)
		{
			max = i;
		}
	}

    printf("%d", max);

    return 0;
}