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#include <stdio.h>

unsigned long ska[202001];

int main () {
	unsigned long n, i, a, max;
	scanf ("%ld\n", &n);
	i = 0;
	max = 0;
	while (i < n) {
		scanf ("%ld", &a);
		ska[a]++;
		i++;
		if (a > max)
			max = a;
	}
	i = 1;
	while (i <= max) {
		if (ska[i] > 1) {
			ska[i+1] += (ska[i]/2);
			if (i == max)
				max++;
		}
		i++;
	}
	printf ("%ld\n", max);
	return 0;

}