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#include <iostream>

using namespace std;
#define Int long long int
#define MAX_EXP 201718
#define DEBUG(x)

int main() {
    ios::sync_with_stdio(false);

    DEBUG(cout << "Podaj n:\n";)
    int n;
    cin >> n;

    DEBUG(cout << "Podaj wykladniki:\n";)
    Int tab[MAX_EXP + 1];
    for (auto i = 0; i < MAX_EXP + 1; ++i)
        tab[i] = 0;
    int in_val;
    int in_max = 0;
    for (auto i = 0; i < n; ++i) {
        cin >> in_val;
        ++tab[in_val];
        if (in_val > in_max) {
            in_max = in_val;
        }
    }

    for (auto i = 1; i < in_max; ++i) {
        if (tab[i] > 1) {
            tab[i + 1] += tab[i] / 2;
        }
    }

    Int cnt = tab[in_max];
    Int max_val = in_max;
    while(cnt > 1) {
        cnt /= 2;
        ++max_val;
    }

    cout << max_val << endl;
    return 0;
}