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#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int n,k;
    cin>>n;
    int tab[201719];
    for(int j=0; j<201719; j++){tab[j]=0;}
    for(int i=0; i<n; i++)
    {
        cin>>k;
        tab[k]++;
    }
   
   
    for(int z=0; z<201718; z++)
    {
        if(tab[z]>=2)
        {
            tab[z+1]+=tab[z]/2;
            tab[z]=tab[z]%2;
        }
    }
   
    int x = 201718;
   
    while(tab[x]==0)
    {x--;}
    int result = x + (int)floor(log2((tab[x])));
    cout<<result;
   
   return 0;
}