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#include <bits/stdc++.h>

using namespace std;

#define maxn  500010
#define kolor 100010
#define ll long long
#define pb(n) push_back(n)
#define mp make_pair
#define luk(n,m) for(int i=n; i<m; ++i)
#define inf  1000000010
#define mod 1000000007
#define sf second.first
#define ss second.second
#define ff first.first
#define fs first.second
#define LOGN 13

int tab[maxn];

int main()
{
    int n,a,maxi=0;
    scanf("%d", &n);
    luk(0,n)
    {
        scanf("%d", &a);
        tab[a]++;
    }
    luk(0,maxn-10)
    {
        if(tab[i]!=0)
        {
            maxi=i;
            tab[i]/=2;
            tab[i+1]+=tab[i];
        }
    }
    printf("%d\n", maxi);
    return 0;
}