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#include <iostream>
#include <array>

class {
    void get() {
        int n, x;
        std::cin >> n;

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

    void process() {
        auto it = coins.begin();
        for(;it < coins.end() - 2; ++it) {
            if(*it == 0) {
                continue;
            }
            if(*it == 1) {
                max = it - coins.begin();
            }
            else {
                *(it + 1) += *it / 2;
            }
        }

        ++it;

        if(*it >= 1) {
            int a_dist = it - coins.begin();
            while(*it > 1) {
                ++a_dist;
                *it /= 2;
            }
            max = a_dist;
        }
    }

    void display() {
        std::cout << max;
    }

    std::array<int, 201719> coins = {{}};
    int max;

public:
    int run()
    {
        std::cin.tie(nullptr);
        std::ios_base::sync_with_stdio(false);

        get();
        process();
        display();

        return 0;
    }
} moneybox;

int main() { return moneybox.run(); }