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#include <iostream>
#include <list>

int main() {
    int n;
    std::cin >> n;
    std::list<int>::iterator it;
    std::list<int> mylist;
    int temp;
    for (int i = 0; i < n; i++) {
        std::cin >> temp;
        mylist.push_front(temp);
    }
    mylist.sort();

    bool wasMerged = true;
    while(wasMerged) {
        wasMerged = false;
        int current;
        int next;
        if(mylist.size() > 1) {
            for (it = mylist.begin(); it != --mylist.end(); ++it) {
                current = *it;
                next = *++it;
                it--;
                if (current == next) {
                    int a = *it;
                    mylist.push_back(++a);
                    it = mylist.erase(it);
                    it = mylist.erase(it);
                    wasMerged = true;
                }
            }
            mylist.sort();
        }
    }

    std::cout << *--mylist.end();
    return 0;
}