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#include <iostream>
using namespace std;

#define MAX 202000

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    bool pocket[MAX];

    for(int i = 0; i < MAX; i++)
        pocket[i]=false;

    int n,cur;
    int max=-1;
    cin>>n;

    while(n--)
    {
        cin>>cur;

        while(1)
        {
            if(!pocket[cur])
                break;
            pocket[cur]=false;
            cur++;
        }
        pocket[cur]=true;

        //cerr<<cur<<endl;

        if(cur>max)
            max = cur;
    }

    cout<<max<<'\n';

    return 0;
}

/*
5
3 4 1 3 3
 */