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#include <iostream>
using namespace std;
const int MAXW = 201718;
int licz[MAXW + 5];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    int maks = 0;
    for (int i = 0; i < n; i++)
    {
        int a;
        cin >> a;
        licz[a]++;
        if (maks < a)
            maks = a;
    }
    int p = 0;
    for (int i = 0; i < maks + 1; i++)
    {
        licz[i] += p;
        p = licz[i] / 2;
    }
    while (p > 0)
    {
        p /= 2;
        maks++;
    }
    cout << maks << "\n";
}