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#include <iostream>
#include <stdio.h>
#include <string>
#include <math.h>
using namespace std;

#define ull  unsigned long long


int main()
{
    int n = 0;
    int x = 0;

    const int N = 201740;

    int b[N] = {};

    cin >> n;
    for (int i = 0; i < n; ++i)
    {
        cin >> x;
        ++b[x];
    }

    for (int i = 0; i < N; ++i)
    {
        n = b[i];
        x = 1;
        while (n > 1)
        {
            n >>= 1;
            if (n & 1)
                ++b[i+x];
            ++x;
        }
    }

    for (int i = N - 1; i >= 0 ; --i)
    {
        if (b[i] != 0)
        {
            cout << i;
            break;
        }
    }


    return 0;
}