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#include <iostream>
#include <algorithm>

bool monety[300000];
int max_moneta;

int main() {
    int n;
    std::cin >> n;
    for (int i = 0; i < n; i++) {
        int a;
        std::cin >> a;
        while (monety[a]) {
            monety[a++] = false;
        }
        monety[a] = true;
        max_moneta = std::max(max_moneta, a);
    }
    std::cout << max_moneta << std::endl;
    return 0;
}