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#include <iostream>
#include <vector>
#include <algorithm>

using std::cin;
using std::cout;
using std::endl;
using std::vector;
using std::max;

using Bank = vector<char>;

Bank bank;
int highestPos = 0;
void putToBank(Bank &bank, int pos) {
    while (bank[pos]) {
        bank[pos++] = 0;
    }
    bank[pos] = 1;
    highestPos = max(highestPos, pos);
}

int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);
    bank.resize(201718 + 21, 0);
    int n, k;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> k;
        putToBank(bank, k);
    }
    cout << highestPos << endl;
}