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#include <iostream>
#include <vector>
using namespace std;

#define MAXN 210000

int main() {
    int n;
    cin >> n;
    vector<int> v(MAXN);
    int ma = 0;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        v[a]++;
        ma = max(ma, a); 
    } 
    for (int i = 0; i <= ma; i++) {
        if (v[i] > 1) {
            v[i + 1] += v[i] / 2;
            if (i == ma) ma++;
        }   
    }   
    cout << ma << endl;
    return 0; 
}