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#include<cstdio>

int tab[201719];

int main()
{
	int n;
	int max = 0;
	scanf("%d", &n);
	for(int i = 0; i < n; i++)
	{
		int x;
		scanf("%d", &x);
		if(x > max)
			max = x;
		tab[x]++;
	}
	for(int i = 0; i < max; i++)
	{
		tab[i+1] += tab[i] >> 1;
	}
	int result = max;
	while(tab[max] > 1)
	{
		result++;
		tab[max] >>= 1;
	}
	printf("%d\n", result);
	return 0;
}