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#include <iostream>
#include <algorithm>

using namespace std;
int n, maxi = 0;
int ile[300000];

int main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        ile[a]++;
        maxi = max (maxi, a);
    }
    for (int i = 1; i <= maxi; i++) {
        ile[i] += ile[i - 1] / 2;
    }
    cout << maxi + ile[maxi] / 2;
    return 0;
}