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#include <bits/stdc++.h>

using namespace std;

int main()
{
	ios::sync_with_stdio( false );

    int n = 0;
    cin >> n;
    
    map<int,int> values;
    
    while(n--)
    {
        int v = 0;
        cin >> v;
        
        auto it = values.insert({v, 1});
        if (!it.second)
            it.first->second += 1;
    }
    
    auto it = values.begin();
    while(*it != *values.rbegin())
    {
        int q = it->second;
        int v = it->first;
        
        auto tr = values.insert({v+1, q/2});
        if (!tr.second)
            tr.first->second += q/2;
        
        it = tr.first;
    }
    
    int r = it->first;
    while(it->second /= 2)
        r++;
    
    printf("%d\n", r);

    return 0;
}