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#include <cstdio>
using namespace std;
const int MAXN = 10;// 3e5;
int A[MAXN];//={0};
int n, x;
int main() {

	for (int i = 0; i < MAXN; i++)
		A[i] = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d", &x);
		A[x]++;
	}

	for (int i = 1; i < MAXN; i++)
		A[i] += A[i - 1] / 2;

	for (int i = MAXN - 1; i >= 0; i--) {
		if (A[i] != 0) {
			printf("%d\n", i);
			break;
		}
	}


	return 0;
}