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#include <iostream>

using namespace std;

int A[300000];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
    int N;cin>>N;
    int K;
    int Max = 0;
    for(int i = 0;i < N;i++)
    {
        cin>>K;
        if(K > Max)Max = K;
        A[K]++;
    }
    for(int i = 0; i <= Max;i++)
    {
        A[i + 1] += A[i]/2;
        if(A[Max + 1] > 0)
        {
            Max++;
        }
    }
    cout<<Max;

}