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#include <iostream>

using namespace std;

const int M=300000;
int ile[M];

int main()
{
    ios_base::sync_with_stdio(false);

    int n;
    cin>>n;
    for (int i=0; i<n; ++i)
    {
        int a;
        cin>>a;
        ++ile[a];
    }

    int wyn=0;
    for (int i=0; i<M-1; ++i)
        if (ile[i])
        {
            wyn=i;
            ile[i+1]+=ile[i]/2;
        }
    cout<<wyn<<endl;

    return 0;
}