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#include <bits/stdc++.h>

int main(){
    int n;
    std::cin >> n;
    int N = 202000;
    int *zliczanie = new int[N];
    for (int i = 0; i < N; i++)
        zliczanie[i] = 0;

    int x;
    int result = 0;
    for (int i = 0; i < n; i++){
        std::cin >> x;
        while (zliczanie[x] == 1){
            zliczanie[x] = 0;
            x++;
        }
        zliczanie[x] = 1;
        result = std::max(result, x);
    }
    delete[]zliczanie;
    std::cout << result << "\n";
}