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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;
    vector<uint8_t> coins (210000,0);
    int max =0;
    for (int i=0; i<n; i++){
        int a;
        cin>>a;
        while (coins[a]==1){
            coins[a]=0;
            a++;
        }
        coins[a]=1;
        if (a>max) max=a;
    }

    cout << max << endl;
    return 0;
}