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#include <iostream>
using namespace std;

int tab[300000];
int main ()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    int mal = 1000000;
    for (int i=0;i<n;i++)
    {
        int a;
        cin >> a;
        tab[a]++;
        if (a<mal)
            mal = a;
    }
    int ma=0;
    for (int i=mal;i<300000;i++)
    {
        if (tab[i]>0)
            ma=i;
        tab[i+1]+=tab[i]/2;
    }
    cout <<ma;
}