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#include <cmath>
#include <cstdio>

#define SKA_ENABLED

using namespace std;

static const int N = 1000000;
static const int K = 201718;
static const int M = 1 + log(N)/log(2);

static const int q[M] =
{
    1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288
};

static int a[K + M + 1];

#ifdef SKA_ENABLED
int main()
{
    int n;

    while(scanf("%d", &n) > 0)
    {
        for(int i = 0; i < n; i++)
        {
            int u;
            scanf("%d", &u);
            a[u]++;
        }

        for(int i = 0; i <= K; i++)
        {
            const int u = a[i];

            for(int j = 0; j < M; j++)
            {
                a[i + j] += (bool)(u & q[j]);
            }

            a[i] -= u;
        }

        int r = K + M;

        while(a[r] == 0)
        {
            r--;
        }

        printf("%d\n", r);
    }

    return 0;
}
#endif