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#include <iostream>
using namespace std;

#include "stdio.h"

#define	MM	1000000
#define DD	24
#define NN	201708

int		 ss[NN + DD];

int main()
{
	int	 n, a, i, p, x;
	
	scanf("%d", &n);
	while (n--)
	{
		scanf("%d", &a);
		ss[a]++;
	}
	
	p = 0;
	x = 0;
	n = NN + DD;
	for (i=0; i<n; i++)
	{
		p	+= ss[i];
		if (p>0)
			x	= i;
			
		ss[i]	= p & 0x01;
		p	>>= 1;
	}

	printf("%d\n", x);
	
	return 0;
}