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#include <iostream>


int main() {

    int n;
    std::cin >> n;

    int *tab = new int[202000];

    int j = 0;

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

    int max = 0;
    for(int i = 0; i < 202000; i++) {
        tab[i+1] += tab[i] / 2;
        if(tab[i+1]) max = i+1;
    }

    std::cout << max << std::endl;
    delete [] tab;
}