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#include <iostream>
#include <cstdlib>


using namespace std;

long int n, i,a, maks;
long int ilepoteg2[1000000];

int main(void) 
{
	ios_base::sync_with_stdio(0);
	cin>>n; //n - 10^6 przypadkow
	maks=0;
	for (i=1;i<=n;i++)
	{
		cin>>a; 
		ilepoteg2[a]++; 
		if (ilepoteg2[a]>1) 
		{
			ilepoteg2[a+1]+=ilepoteg2[a]/2;
		 	ilepoteg2[a]=ilepoteg2[a]%2;
			a++;
		
		}
		if (maks<a) maks=a;
	}

	if (ilepoteg2[maks]>1) maks++;
	cout<<maks;
	return 0;
}