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#include<iostream>
#include<string>
#include<set>
#include<list>
#include<map>
#include<vector>
#include<queue>
#include<stack>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <stdio.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    map<long long, long long> nominaly;
    map<long long, long long>::iterator it;
    int n;
    cin>>n;
    while(n--)
    {
        long long a;
        cin>>a;
        nominaly[a]++;
    }
    for(it=nominaly.begin(); it!=nominaly.end(); it++)
    {
        int a = it->first;
        int b = it->second;
        if(b/2 > 0)
        {
            nominaly[a+1] += b/2;
            //nominaly[a] = b/2;
        }
    }
    it = nominaly.end();
    it--;
    cout<<it->first;
    /*
    for(it=nominaly.begin(); it!=nominaly.end(); it++)
    {
        int a = it->first;
        int b = it->second;
        cout<<a<<" "<<b<<endl;
    }
    */
}