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#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <deque>
#include <stack>
#include <iterator>
#include <numeric>
#include <tuple>
#include <set>
#include <functional>

typedef unsigned long long ULL;
typedef unsigned long UL;
typedef unsigned int UI;
typedef long long LL;
typedef std::pair<long, long> PLL;
typedef std::tuple<LL, LL, LL> PLLL;

int main(int argc, char **argv)
{
    int n;
    std::cin>>n;
    std::set<UI, std::greater<UI>> coins;
    UI coin;
    for(int i = 0; i < n; ++i) {
        std::cin>>coin;
        auto ins = coins.insert(coin);
        while(!ins.second) {
            coins.erase(coin);
            coin++;
            ins = coins.insert(coin);
        }
    }
    auto res = coins.begin();
    std::cout<<*res<<std::endl;
    return 0;
}