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#include <iostream>

using namespace std;

const int MAX = 201718;
const int OFFSET = 24;

int main(){
    ios_base::sync_with_stdio();
    int n;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++)
        cin >> a[i];

    int count[MAX + OFFSET];
    for (int i = 0; i < MAX + OFFSET; i++)
        count[i] = 0;
    for (int i = 0; i < n; i++)
        count[a[i]]++;

    for (int i = 0; i < MAX + OFFSET - 1; i++)
        count[i + 1] += count[i] / 2;

    for (int i = MAX + OFFSET - 1; i >= 0; i--)
        if (count[i] > 0){
            cout << i << endl;
            break;
        }

    /*
    for (int i = 0; i < 50; i++)
        cout << i << " " << count[i] << endl;
    */
    return 0;
}