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#include <bits/stdc++.h>

using namespace std;

int tab[1000007];

int main()
{
    int n,a,maks=-1, id=0;

    scanf("%d", &n);

    for(int i=1;i<=n;i++)
    {
        scanf("%d", &a);
        tab[a]++;

        maks=max(maks,a);
    }

    while(id<=maks || tab[id]!=0)
    {
        tab[id+1]+=tab[id]/2;
        id++;
    }

    cout<<id-1;



    return 0;
}