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#include <cstdio>
using namespace std;
int main()
{
    bool* tablica = new bool[300000];
    for(int i = 0; i < 300000; i++)
        tablica[i]=false;
    int n;
    scanf("%d", &n);
    int k;
    int max = 0;
    for(int i = 0; i < n; ++i)
    {
        scanf("%d", &k);
        while(true)
        {
            if(tablica[k])
            {
                k += 1;
                tablica[k-1] = false;
                continue;
            }
            else
            {
                tablica[k] = true;
                if (k > max)
                    max = k;
                break;
            }
        }
    }
    printf("%d\n", max);
    return 0;
}