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#include<iostream>
using namespace std;
int m,p,w;
int main ()
{
    ios_base::sync_with_stdio (0);
    cin>>m;
    bool l[201719];
    for(m; m>0; m--)
    {
        cin>>p;
        p--;
        if(l[p]==0)
        {
            l[p]=1;
            if(w<p+1)
            {
                w=p+1;
            }
        }
        else
        {
            if(l[p+1]==0)
            {
                l[p]=0;
                l[p+1]=1;
                if(w<p+2)
                {w=p+2;}
            }
            else
            {
                while(l[p+1]==1)
                {
                    l[p]=0;
                    l[p+1]=0;
                    p++;
                }
                l[p+1]=1;
                if(w<p+2)
                {w=p+2;}
            }
        }
    }
    cout<<w;
    return 0;
}