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#include<iostream>
#include<cstdio>
using namespace std;
int tab[2000000];
int main()
{
int n, i, wyn = 0, a, maks = 0;
scanf("%d",&n);
for(i = 0; i < n; ++i) {
	scanf("%d",&a);
	tab[a]++;
	maks = max(maks,a);
}
for(i = 1; i <= maks; ++i) {
	tab[i] += tab[i-1]/2;
}
while(tab[i-1] > 0){
	tab[i] += tab[i-1]/2;
	if(tab[i] == 1) maks = i;
	++i;
}
//for(int j = 0; j <= maks + 5; ++j) printf("%d ",tab[j]);

printf("%d",maks);
return 0;
}