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#include <iostream>
using namespace std;

int tab[1000000];

int main(){
    ios_base::sync_with_stdio(false);
    int n;
    cin>>n;
    int maks = 0;
    for( int i = 0; i < n; i++ ){
        int x;
        cin>>x;
        tab[x]++;
        maks = max( maks, x );
    }
    int res = 0;
    while( res <= maks || tab[res] > 0 ){
        tab[res+1] += (tab[res]>>1);
        res++;
    }
    cout<< res - 1 << endl;
    //cin>>n;
}